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Fluorinated semi-interpenetrating polymer networks for enhancing the mechanical performance and storage stability of polymer-bonded explosives by controlling curing and phase separation rates
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作者 Chao Deng Huihui Liu +1 位作者 Yongping Bai Zhen Hu 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第8期58-66,共9页
Herein, the effect of fluoropolymer binders on the properties of polymer-bonded explosives(PBXs) was comprehensively investigated. To this end, fluorinated semi-interpenetrating polymer networks(semiIPNs) were prepare... Herein, the effect of fluoropolymer binders on the properties of polymer-bonded explosives(PBXs) was comprehensively investigated. To this end, fluorinated semi-interpenetrating polymer networks(semiIPNs) were prepared using different catalyst amounts(denoted as F23-CLF-30-D). The involved curing and phase separation processes were monitored using Fourier-transform infrared spectroscopy, differential scanning calorimetry, a haze meter and a rheometer. Curing rate constant and activation energy were calculated using a theoretical model and numerical method, respectively. Results revealed that owing to its co-continuous micro-phase separation structure, the F23-CLF-30-D3 semi-IPN exhibited considerably higher tensile strength and elongation at break than pure fluororubber F2314 and the F23-CLF-30-D0 semi-IPN because the phase separation and curing rates matched in the initial stage of curing.An arc Brazilian test revealed that F23-CLF-30-D-based composites used as mock materials for PBXs exhibited excellent mechanical performance and storage stability. Thus, the matched curing and phase separation rates play a crucial role during the fabrication of high-performance semi-IPNs;these factors can be feasibly controlled using an appropriate catalyst amount. 展开更多
关键词 Semi-interpenetrating polymer networks FLUOROpolymer Curing rate Phase separation rate polymer-bonded explosives
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Anion exchange membranes with a semi-interpenetrating polymer network using 1,6-dibromohexane as bifunctional crosslinker
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作者 Aijie Li Zhanliang Wang +6 位作者 Zhihao Si Lu Lu Peipei Huang Jinhong Liu Songyuan Yao Peiyong Qin Xinmiao Zhang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第8期199-208,共10页
An anion exchange membrane(AEM)is generally expected to possess high ion exchange capacity(IEC),low water uptake(WU),and high mechanical strength when applied to electrodialysis desalination.Among different types of A... An anion exchange membrane(AEM)is generally expected to possess high ion exchange capacity(IEC),low water uptake(WU),and high mechanical strength when applied to electrodialysis desalination.Among different types of AEMs,semi-interpenetrating polymer networks(SIPNs)have been suggested for their structural superiorities,i.e.,the tunable local density of ion exchange groups for IEC and the restrained leaching of hygroscopic groups by insolubility for WU.Unfortunately,the conventional SIPN AEMs still struggle to balances IEC,WU,and mechanical strength simultaneously,due to the lack of the compact crosslinking region.In this work,we proposed a novel SIPN structure of polyvinylidene difluoride/polyvinylimidazole/1,6-dibromohexane(PVDF/PVIm/DBH).On the one hand,DBH with two cationic groups of imidazole groups are introduced to enhance the ion conductivity,which is different from the conventional monofunctional modifier with only one cationic group.On the other hand,DBH has the ability to bridge with PVIm,where the mechanical strength of the resulting AEM is increased by the increase of crosslinking degree.Results show that a low WU of 38.1%to 62.6%,high IEC of 2.12—2.22 mmol·g^(-1),and excellent tensile strength of 3.54—12.35 MPa for PVDF/PVIm/DBH membrane are achieved.This work opens a new avenue for achieving the high-quality AEMs. 展开更多
关键词 Anion exchange membrane Polyvinylidene difluoride ELECTRODIALYSIS Semi-interpenetrating polymer networks
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High Water Resistance and Enhanced Mechanical Properties of Bio-Based Waterborne Polyurethane Enabled by in-situ Construction of Interpenetrating Polymer Network
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作者 Henghui Deng Jingyi Lu +5 位作者 Dunsheng Liang Xiaomin Wang Tongyao Wang Weihao Zhang Jing Wang Chaoqun Zhang 《Journal of Renewable Materials》 SCIE EI 2023年第3期1209-1222,共14页
In this study,acrylic acid was used as a neutralizer to prepare bio-based WPU with an interpenetrating polymer network structure by thermally induced free radical emulsion polymerization.The effects of the content of ... In this study,acrylic acid was used as a neutralizer to prepare bio-based WPU with an interpenetrating polymer network structure by thermally induced free radical emulsion polymerization.The effects of the content of acrylic acid on the properties of the resulting waterborne polyurethane-poly(acrylic acid)(WPU-PAA)dispersion and the films were systematically investigated.The results showed that the cross-linking density of the interpenetrating network polymers was increased and the interlocking structure of the soft and hard phase dislocations in the molecular segments of the double networks was tailored with increasing the content of acrylic acid,leading to enhancement of the mechanical properties and water resistance of WPU-PAA films.Notably,with the increase in content of acrylic acid,the tensile strength,Young’s modulus,and toughness of the WPU-PAA-110 film increased by 3 times,and 8 times,and 2.4 times compared with WPU-PAA-80,respectively.The WPU-PAA-100 film showed the best water resistance,and the water absorption rate at 96 h was only 3.27%.This work provided a new design scheme for constructing bio-based WPU materials with excellent properties. 展开更多
关键词 Bio-based waterborne polyurethane interpenetrating polymer network highly water resistance superior mechanical performance
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Study of Hydrophobic Nature of Fullerene-Based Poly (Methyl Hydro Siloxane) and Polyacrylonitrile Interpenetrating Polymer Network
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作者 Mohd. Meraj Jafri Meet Kamal +1 位作者 Subhash Mandal Sanjay Kanojia 《Journal of Materials Science and Chemical Engineering》 2023年第11期15-27,共13页
In this study, the effect of combining different molecular domains on single platform has been reported that revealed a proper packing and interpenetration of fullerene spheres with the monomeric species. The fabricat... In this study, the effect of combining different molecular domains on single platform has been reported that revealed a proper packing and interpenetration of fullerene spheres with the monomeric species. The fabricated IPN system exhibits hydrophobic behavior in nature. An interpenetrating polymer network (IPN) of fullerene-based poly (methyl hydro siloxane) (PMHS) and polyacrylonitrile (PAN) was prepared. The synthesized polymer network was characterized using infrared (IR) spectroscopy, differential scanning calorimetric analysis (DSC), and scanning electron microscopic (SEM) technique. The IPN was analyzed by IR spectroscopy, which depicts presence of fullerene at 500 cm<sup>−1</sup> and 1632 cm<sup>−1</sup>, presence of PHMS at 1050 cm<sup>−1</sup>, 1250 cm<sup>−1</sup>, 2225 cm<sup>−1</sup>, and 3000 cm<sup>−1</sup> and presence of PAN at 3077 cm<sup>−1</sup>, 1299 cm<sup>−1</sup>, 1408 cm<sup>−1</sup> and 2083 cm<sup>−1</sup>. Shifting in band positions indicated the interpenetration of the reacting species. DSC endotherm showed crystalline peak (T<sub>c</sub>) at 117˚C, which indicated the crystalline nature of the synthesized IPN. The absence of T<sub>g</sub> peak and clear observable T<sub>c</sub> peak revealed crystalline behavior of polymeric network. The microstructure of the polymer network was observed by SEM technique, which revealed transparent and dual-phase morphology of the IPN surface. The fluorescent emission spectra of polymeric network were recorded on a spectrofluorometer which revealed fluorescent excitation and emission spectra of the IPN. The Emission spectra generated by radiative decay of excitations exhibit a maximal peak at 450 nm, suggesting that the synthesized IPN nanosheets were typically high-intensity blue light emitting materials. The FTIR investigations revealed multiple non-covalent interactions achieved by polymerization with physical anchoring on the polymeric network surfaces. Such interactions can be recognized as the driving force for the fabrication of hydrophobic flexible silicon-based materials with a self-cleansing action. 展开更多
关键词 POLYACRYLONITRILE PMHS IPN polymeric network
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PREPARATION AND PROPERTIES OF GEL POLYMER ELECTROLYTE BASED ON PVDF/ACRYLATE INTERPENETRATING POLYMER NETWORK FOR DYE-SENSITIZED SOLAR CELL
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作者 杨艳 陶杰 +1 位作者 金鑫 秦琦 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2010年第4期353-360,共8页
The gel polymer electrolytes(GPEs)based on poly(vinylidence fluoride)(PVDF)/acrylate interpenetrating polymer network(IPN)are prepared.The micro-phase separation type GPEs are characterized by Fourier transfor... The gel polymer electrolytes(GPEs)based on poly(vinylidence fluoride)(PVDF)/acrylate interpenetrating polymer network(IPN)are prepared.The micro-phase separation type GPEs are characterized by Fourier transform infrared(FTIR)spectroscopy,scanning electron microscope(SEM),respectively.Moreover,the conductivity and the voltage-current curves of the electrolytes are measured by electrochemical workstation.The higher porosity and electrolyte uptake are observed in the membranes prepared at lower crosslinker concentration.The suitable cross-linking acrylate monomer improves the porosity and the electrochemical behavior of GPE.A dye-sensitized solar cell(DSSC)employing PGE based on PVDF/poly(ethylene glycol dimethacrylate)(PEGDMA)IPN yields an open-circuit voltage of 0.674 V,short-circuit current of 8.476 mA·cm-2and the conversion efficiency of 2.710% under 100 mW·cm-2illumination. 展开更多
关键词 solar cells interpenetrating polymer network ploymer films GELS
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Studies on the Morphology of Natural Rubber/Polyacrylate Interpenetrating Polymer Networks 被引量:3
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作者 Llao Kalrong (Institute of Polymer Science, Zhangshan University, Guangzhou)Thomas C. Ward (Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1990年第1期85-89,共5页
The interpenetrating polymer network(IPN) systems have attracted a lot of attention because of their unique two-phase structure and properties. There have been many publications concerning the IPNs in which poly (isop... The interpenetrating polymer network(IPN) systems have attracted a lot of attention because of their unique two-phase structure and properties. There have been many publications concerning the IPNs in which poly (isoprene) (PIP) or polyacrylates (PAC) is formed as one of the networks.In the present study, Four serles of natural rubber(NR)/PAC IPNs were prepared and their morphologies were investigated with dynamic mechanics analysis(DMA) and transmission electron microscopy (TEM). 展开更多
关键词 Interpenetrating polymer network Natural rubber POLYACRYLATE
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Structural characteristics and properties of polyurethane modified TDE-85/MeTHPA epoxy resin with interpenetrating polymer networks 被引量:2
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作者 李芝华 黄耀鹏 +1 位作者 任冬燕 郑子樵 《Journal of Central South University of Technology》 EI 2008年第3期305-308,共4页
Diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate(TDE-85)/methyl tetrahydrophthalic anhydride (MeTHPA) epoxy resin was modified with polyurethane(PU) and the interpenetrating polymer networks(IPNs) of PU-modified TDE-... Diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate(TDE-85)/methyl tetrahydrophthalic anhydride (MeTHPA) epoxy resin was modified with polyurethane(PU) and the interpenetrating polymer networks(IPNs) of PU-modified TDE-85/MeTHPA resin were prepared. The structural characteristics and properties of PU-modified TDE-85/MeTHPA resin were investigated by Fourier transform infrared(FTIR) spectrum,emission scanning electron microscopy(SEM) and thermogravimetry(TG). The results indicate that epoxy polymer network (Ⅰ) and polyurethane polymer network (Ⅱ) of the modified resin can be obtained and the networks (Ⅰ) and (Ⅱ) interpenetrate and tangle highly each other at the phase interface. The micro morphology presents heterogeneous structure. The integrative properties of PU-modified TDE-85/MeTHPA epoxy resin are improved obviously. The PU-modified TDE-85/ MeTHPA resin's tensile strength reaches 69.39 MPa,the impact strength reaches 23.56 kJ/m,the temperature for the system to lose 1% mass (t1%) is 300 ℃,and that for the system to lose 50% mass (t50%) is 378 ℃. Compared with those of TDE-85/MeTHPA resin,the tensile strength,impact strength,t1% and t50% of the PU-modified resin increases by 48%,115%,30 ℃,11 ℃,respectively. The PU-modified TDE-85/MeTHPA resin has the structure characteristics and properties of interpenetrating polymer networks. 展开更多
关键词 POLYURETHANE epoxy resin interpenetrating polymer networks tensile strength impact strength thermal stability
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Polymerization Process and Morphology of Polyurethane/Vinyl Ester Resin Interpenetrating Polymer Networks 被引量:1
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作者 Dongyan TANG Xuelian WU Liangsheng QIANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第3期423-426,共4页
A series of polyurethane (PU)/vinyl ester resin (VER) simultaneous IPNs (interpenetrating polymer networks) with different component ratios and comonomers types introduced to VER were synthesized and the polymer... A series of polyurethane (PU)/vinyl ester resin (VER) simultaneous IPNs (interpenetrating polymer networks) with different component ratios and comonomers types introduced to VER were synthesized and the polymerization processes were traced by Fourier transform infrared spectroscopy (FTIR) to study the kinetics of IPNs and hydrogen bonding action within multi-component. Furthermore, the relationship of polymerization process with morphology was investigated in detail for the first time by the morphological information given by chemical action between two networks besides physical entanglement, atomic force microscope (AFM) observation and dynamic mechanical analysis (DMA). The results indicated that the degree of hydrogen bonding (Xb,UT,%), calculated from functional group conversional rate and fine structures gained from FT-IR spectra of two networks, were affected by PU/VER weight ratios and comonomer types of VER. The relationship of formation kinetics and morphology showed that the change of Xb,UT (%) values exhibited excellent consistency with that of phase sizes observed by AFM and detected by DMA. 展开更多
关键词 Polyurethane (PU) Interpenetrating polymer networks (IPNs) polymerization process MORPHOLOGY
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Preparation,Morphology and Damping Property of PU/UP Interpenetrating Polymer Networks 被引量:1
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作者 Dongyan TANG Liangsheng QIANG +1 位作者 Zheng JIN Liancheng ZHAO 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第4期585-588,共4页
Interpenetrating polymer networks (IPNs) composed of acrylate-modified polyurethane (PU)/unsaturated polyester (UP) resin via simultaneous polymerization with various component ratios of PU/UP were prepared. The... Interpenetrating polymer networks (IPNs) composed of acrylate-modified polyurethane (PU)/unsaturated polyester (UP) resin via simultaneous polymerization with various component ratios of PU/UP were prepared. The polymerization processes of IPNs were traced through infrared spectrum (IR) techniques, by which the phase separation in systems could be controlled effectively. Results for the morphology and miscibility among multiple phases of IPNs, obtained by transmission electron microscope (TEM) indicated that the domains between two phases were constricted in nanometer scales. The dynamic mechanical thermal analyzer (DMTA) detection results revealed that the loss factor (tanS) and loss modulus (E″) increased with the polyurethane amounts in system, and the peak value in curves of tanδ and E″ appeared toward low temperature ranges. Maximum tanδ values of all samples were above 0.3 in the nearly 50℃ ranges. Also, the mechanical properties of PU/UP IPNs were studied in detail. 展开更多
关键词 Interpenetrating polymer networks (IPNs) NANOCOMPOSITES Damping property MORPHOLOGY
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Synthesis and Characterization of Polyurethane and Epoxy Resin Interpenetrating Polymer Network 被引量:1
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作者 吴晓燕 杨晓慧 +1 位作者 刘允航 王新灵 《Journal of Shanghai Jiaotong university(Science)》 EI 2005年第2期193-196,202,共5页
A series of Polyurethane (PU)/bisphenol A based Epoxy Resin(EP) Interpenetrating Polymer Networks(IPN) were synthesized and characterized by SEM, DSC, TGA and DMTA. It was found that IPN shows the best compatibility a... A series of Polyurethane (PU)/bisphenol A based Epoxy Resin(EP) Interpenetrating Polymer Networks(IPN) were synthesized and characterized by SEM, DSC, TGA and DMTA. It was found that IPN shows the best compatibility and damping properties when the ratio of PU/EP is 80 to 20. The results show that chain-extender and higher molecular weight of PPG are able to improve the properties of compatibility, damping and thermal properties. 展开更多
关键词 interpenetrating polymer networks(IPN) POLYURETHANE epoxy resin compatibility damping (properties)
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Semi-Interpenetrating Novolac-Epoxy Thermoset Polymer Networks Derived from Plant Biomass 被引量:1
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作者 Mehul Barde Yusuf Celikbag +2 位作者 Brian Via Sushil Adhikari Maria LAuad 《Journal of Renewable Materials》 SCIE 2018年第7期724-736,共13页
Bio-based phenol-formaldehyde polymer (BioNovolac) was developed by reacting molar excess of bio-oil/phenolwith formaldehyde in acidic medium. Glycidyl 3,5-diglycidoxybenzoate (GDGB), was prepared by directglycidylati... Bio-based phenol-formaldehyde polymer (BioNovolac) was developed by reacting molar excess of bio-oil/phenolwith formaldehyde in acidic medium. Glycidyl 3,5-diglycidoxybenzoate (GDGB), was prepared by directglycidylation of α-resorcylic acid (RA), a naturally occurring phenolic monomer. GDGB was crosslinked in thepresence of BioNovolac by anionic polymerization. Fourier transform infrared spectroscopy (FTIR) confirmedthe formation of semi-interpenetrating polymer networks. The glass transition temperature and moduli of biobasedcrosslinked systems were observed to increase with increasing GDGB content. Active chain density andmass retention measured by dynamic mechanical analysis (DMA) and Soxhlet extraction, respectively, indicated ahigh crosslink density of the cured networks. Scanning electron microscopy (SEM) images depicted thehomogeneity of the bulk phase. The preparation of bio-based epoxy-novolac thermoset network resulted inreduced consumption of petroleum-based chemicals. 展开更多
关键词 Fast pyrolysis BIO-OIL BioNovolac semi-interpenetrating polymer networks
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Thermoreversible Thickening and Self-assembly Behaviors of pH/Temperature Dually Responsive Microgels with Interpenetrating Polymer Network Structure 被引量:1
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作者 刘晓云 杨军 +1 位作者 闫伟霞 査刘生 《Journal of Donghua University(English Edition)》 EI CAS 2014年第3期312-315,共4页
The pH /temperature dually responsive microgels of interpenetrating polymer network( IPN) structure composed of poly( N-isopropylacrylamide)( PNIPAM) network and poly( acrylic acid)( PAA) network( PNIPAM /PAA IPN micr... The pH /temperature dually responsive microgels of interpenetrating polymer network( IPN) structure composed of poly( N-isopropylacrylamide)( PNIPAM) network and poly( acrylic acid)( PAA) network( PNIPAM /PAA IPN microgels) were synthesized by seed emulsion polymerization. The results obtained by dynamic laser light scattering( DLLS) show that the microgels have good pH /temperature dual sensitivities. The temperature sensitive component and the pH sensitive component inside the microgels have little interference with each other. The rheological properties of the concentrated PNIPAM /PAA IPN microgel dispersions as a function of temperature at pH 4. 0 or 7. 0 were investigated by viscometer,and the results displayed that only at pH 7. 0 the dispersions presented thermoreversible thickening behavior. Then the PNIPAM /PAA fibers were prepared by self-assembly of the PNIPAM /PAA IPN microgels in the ice-crystal templates formed by unidirectional liquid nitrogen freezing method. Field emission scanning electron microscopy( FESEM) images indicate that the PNIPAM /PAA fibers are rounded,randomly orientated and interweaved. 展开更多
关键词 interpenetrating polymer network(IPN) structure pH and temperature sensitivity thermo-thickening self-assembly
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SYNTHESIS AND CHARACTERIZATION OF POLYDIMETHYLSILOXANE/POLYSTYRENE SEMIINTERPENETRATING POLYMER NETWORKS
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作者 方世璧 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1999年第6期537-542,共6页
The synthesis of pseudo- and semi-interpenetrating polymer networks (IPNs) based on polydimethylsiloxane (PDMS) and polystyrene (PS) is described. IPNs were obtained by simultaneous and in situ sequential synthesis pr... The synthesis of pseudo- and semi-interpenetrating polymer networks (IPNs) based on polydimethylsiloxane (PDMS) and polystyrene (PS) is described. IPNs were obtained by simultaneous and in situ sequential synthesis procedure. The preliminary studies on IPNs properties such as transition temperature, microphase separation and mechanical behaviors have been carried out by using differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The experimental evidence clearly showed that semi-IPNs obtained by sequential synthesis procedure have higher interpenetrating extent than pseudo-IPNs synthesized by simultaneous procedure. Over the full composition, the PDMS/PS IPNs are immiscible. The pseudo-IPNs microphase separation can be greatly subdued through the formation of grafting bonds between two networks as well as the kinetic rate-matching of the individual network crosslinking. 展开更多
关键词 interpenetrating polymer networks POLYDIMETHYLSILOXANE POLYSTYRENE glass transition temperature MORPHOLOGY mechanical properties
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Preparation of Semi-interpenetrating Polymer Network of Silicon Rubber and Poly(methyl methylacrylate) Using Supercritical CO_2
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作者 Zhi Min LIU Jia Qiu WANG +1 位作者 Guan Ying YANG Bu Xing HAN 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第7期683-684,共2页
The heterogeneous free-radical polymerization of methyl methylacrylate (MMA) and divinylbenzene (DVB) as cross-linker within supercritical carbon dioxide-swollen silicon rubber (SR) has been studied as an approach to ... The heterogeneous free-radical polymerization of methyl methylacrylate (MMA) and divinylbenzene (DVB) as cross-linker within supercritical carbon dioxide-swollen silicon rubber (SR) has been studied as an approach to preparing semi-interpenetrating polymer network (semi-IPN) of SR and poly(methyl methylacrylate) (PMMA). The SR/PMMA semi-IPNs were characterized by scanning electron microscopy (SEM) and dynamic mechanical analyzer (DMA). 展开更多
关键词 Supercritical CO2 interpenetrating polymer network silicon rubber poly(methyl methylacrylate) polymerization.
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Microstrueture and Properties of Fluoroelastomer/Butadiene-Acrylonitrile Rubber Interpenetrating Polymer Networks
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作者 陈春明 XIONG Chuanxi +1 位作者 YANG Jian DONG Lijie 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第1期50-53,共4页
Interpenetrating polymer networks (IPNs) based on fluoroelastomer/butadiene-acrylonitrile rubber (FKM/NBR) by molten blending at a high temperature and chemical cross-linking of two components were prepared. The i... Interpenetrating polymer networks (IPNs) based on fluoroelastomer/butadiene-acrylonitrile rubber (FKM/NBR) by molten blending at a high temperature and chemical cross-linking of two components were prepared. The influence of the two networks component on the mechanical properties and thermostabilities was studied. The experimental results show that the mechanical properties of the IPNs are superior to those of the individual FKM and NBR networks due to forming the case of interpenetrating and intercross-linking between the two networks, the mechanical properties and thermal resistance exhibit higher values when 80/20 (w/w) FKM and NBR is blended and respectively cured simultaneously. The co-continuous morphology of the IPNs in the blends of 80/20 (w/w) FKM/NBR is found by transmission electron microscopy (TEM), the differential scanning calorimetry (DSC) determination shows that the blends of 80/20 (w/w) FKM/NBR have better compatibility, and the glass transition temperature of the elastomer is -21.5 ℃. 展开更多
关键词 FLUOROELASTOMER butadiene-acrylonitrile rubber interpenetrating polymer network BLENDS
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AN EPOXY/(METHYL METHACRYLATE)INTERPENETRATING POLYMER NETWORK FOR NONLINEAR OPTICS
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作者 张灵志 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1999年第5期435-440,共6页
An interpenetrating polymer networks (IPN) consisting of an epoxy-based polymer network and a polymethyl methacrylate network were synthesized and characterized. The IPN showed only one T-g, and hence a homogeneous-ph... An interpenetrating polymer networks (IPN) consisting of an epoxy-based polymer network and a polymethyl methacrylate network were synthesized and characterized. The IPN showed only one T-g, and hence a homogeneous-phase morphology was suggested. The second-order nonlinear optical coefficient (d(33)) of the IPN was measured to be 1.72 X 10(-7) esu. The study of NLO temporal stability at room temperature and elevated temperature (100 degrees C) indicated that the IPN exhibits a high stability in the dipole orientation due to the permanent entanglements of two component networks in the IPN system. Long-term stability of second harmonic coefficients was observed at room temperature for more than 1000 h. 展开更多
关键词 interpenetrating polymer networks second-order optical nonlinearity epoxy-based polymer polymethyl methacrylate
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Effect of Polymer Network Morphology on the Performance of Polymer Dispersed Liquid Crystal (PDLC) Composite Films
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作者 SHEN Jiyuan LIN Haonan +4 位作者 REN Yunxiao SUN Chang BAO Jinying XIAO Jiumei GAO Yanzi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第5期1020-1024,共5页
The effects of the morphologies of liquid crystal (LC) droplets left in polymer network on the performance of polymer dispersed liquid crystal composite films were investigated.By adjusting the relative content range ... The effects of the morphologies of liquid crystal (LC) droplets left in polymer network on the performance of polymer dispersed liquid crystal composite films were investigated.By adjusting the relative content range of the crosslinking and diluents,the morphologies of polymer network can be changed.Therefore,the properties of PDLC composite films with imparity polymer morphologies were obtained by experiments and the finite element simulation.Results of the experimental and finite element simulation showed that the electro-optical properties of PDLC composite films were inversely proportional to the domain size of the polymer network and the mechanical properties were proportional to the domain size of the polymer network. 展开更多
关键词 polymer dispersed liquid crystals polymer network morphology finite element simulation mechanical properties electro-optical properties
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Influence of Interpenetrating Polymer Networks (IPN) Microstructure on Underwater Acoustic Stealth Performance
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作者 罗忠 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第2期272-277,共6页
According to the configuration and absorption theory of polymer macromolecule materials, a kind of IPN with wider temperature range and higher damping property was designed and synthesized. By using the spectrum of dy... According to the configuration and absorption theory of polymer macromolecule materials, a kind of IPN with wider temperature range and higher damping property was designed and synthesized. By using the spectrum of dynamic mechanical thermal analysis (DMTA) and acoustic pulse tube device, the microstructure, phase separation degree, phase size and phase continuity of IPN with different components were analyzed. The experimental results show that the nano size grade of phase, the continuous and homogeneous IPN phase can provide higher absorption coefficient. The absorption coefficient of optimized sample I09 is 0.7 in 2 kHz, and the absorption peak is 0.9 in 4 kHz. Then the underwater acoustic properties of modified IPN filled with mica, micro-balloon and nano-SiO2 were discussed respectively to indicate that the inhomogeneous property of filler-modified IPN can improve the underwater acoustic stealth performance effectively, and the micro size grade of these filler-modified IPN can work well in low frequency acoustic stealth. 展开更多
关键词 interpenetrating polymer networks (IPN) POLYURETHANE DAMPING absorption coefficient FILLERS
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Gas Permeability and Free Volume Hole Properties of Interpenetrating Polymer Network Studied by Positrons
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作者 QI Ning GONG Wei +3 位作者 WANG Zhifen WANG Bo YANG Yurun HU Chunpu 《Wuhan University Journal of Natural Sciences》 CAS 2007年第2期271-274,共4页
A series of polyurethane/epoxy resin interpenetrating polymer networks (PU/ER IPN) were studied by positron annihilation lifetime spectroscopy (PALS). The effects of epoxy resin type and content on the free volume... A series of polyurethane/epoxy resin interpenetrating polymer networks (PU/ER IPN) were studied by positron annihilation lifetime spectroscopy (PALS). The effects of epoxy resin type and content on the free volume properties in IPN were investigated. We found that in PU/ER IPN, the free volume hole size and fractional free volume showed a negative deviation due to closer segmental chain packing through some chemical bonding between PU and epoxy resin. Direct relationship between the gas permeability and the free volume has been established based on the free volume theory. Experimental results revealed that the free volume plays an important role in determining the gas diffusion and permeability. 展开更多
关键词 interpenetrating polymer network positron annihilation free volume gas permeability
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Biosorption of Toxic Zn(ll) Ion from Water Using Ion Imprinted Interpenetrating Polymer Networks
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作者 Girija p Beena Mathew 《Journal of Chemistry and Chemical Engineering》 2013年第6期508-517,共10页
Toxic Zn(II) ion imprinted interpenetrating polymer networks were synthesized for the selective sorption of Zn(ll) from aqueous solutions using a biopolymer alginic acid. The polymeric biosorbant was prepared usin... Toxic Zn(II) ion imprinted interpenetrating polymer networks were synthesized for the selective sorption of Zn(ll) from aqueous solutions using a biopolymer alginic acid. The polymeric biosorbant was prepared using Zn(II) ion as template, acrylamide as functional monomer, cross linker NNMBA (N,N' Methylene-bis-acrylamide) and potassium persulphate as an initiator. The non-imprinted polymer networks were also prepared without use of the Zn(II) ion. The synthesized interpenetrating networks were characterized by various spectral techniques. Metal ion binding studies were carried out and the factors affecting binding were also optimized. Competitive sorption studies were investigated to determine the selectivity of Zn(II) ion imprinted interpenetrating polymer network. Zinc ion imprinted polymer networks showed good selectivity for the target ion. 展开更多
关键词 Interpenetrating polymer network molecular imprinting template metal SELECTIVITY zinc ion.
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