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Electrospinning organic solvent resistant preoxidized poly(acrylonitrile)nanofiber membrane and its properties 被引量:2
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作者 Zhiwei Du Jinxue Cheng +2 位作者 Qinglin Huang Mingxing Chen Changfa Xiao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第1期289-299,共11页
A high performance preoxidized poly(acrylonitrile)(O-PAN)nanofiber membrane with excellent solvent resistance,thermal stability and flexibility was fabricated by the preoxidation of electrospun PAN nanofiber membrane.... A high performance preoxidized poly(acrylonitrile)(O-PAN)nanofiber membrane with excellent solvent resistance,thermal stability and flexibility was fabricated by the preoxidation of electrospun PAN nanofiber membrane.The performance of resultant O-PAN nanofiber membrane was optimized by altering the PAN concentration and preoxidation temperature.The results showed that the O-PAN nanofiber membrane which made from PAN concentration of 14%(mass)and preoxidation temperature of 250.0℃ have a more optimal comprehensive performance.In the long-term separation test of SiO2 particle(1 μm)in DMAc suspension,the permeate flux of O-PAN nanofiber membrane stabilized at 227.91 L·m^(-2)·h^(-1)(25℃,0.05 MPa)while the SiO2 rejection above 99.6%,which showed excellent solvent resistance and separation performance.In order to further explore the application of the O-PAN nanofiber membrane,the OPAN nanofiber membrane was treated with fluoride and used in oil/water separation process.The O-PAN nanofiber membrane after hydrophobic treatment showed excellent hydrophobicity and good oil/water separation performance with the permeate flux about 969.59 L·m^(-2)·h^(-1)while the separation efficiency above 96.1%.The O-PAN nanofiber membrane exhibited a potential application prospect in harsh environment separation. 展开更多
关键词 poly(acrylonitrile)(PAN) PREOXIDATION Nanofiber membrane Solvent resistance Oil/water separation
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Synthesis and Characterization of Proton-conducting Polymer Electrolytes Based on Acrylonitrile-Styrene Sulfonic Acid Copolymer/Layered Double Hydroxides Nanocomposltes 被引量:2
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作者 王盎然 包永忠 +1 位作者 翁志学 黄志明 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第6期938-943,共6页
Acrylonitrile-sodium styrene sulfonate copolymer/layered double hydroxides nanocomposites were prepared by in situ aqueous precipitation copolymerization of acrylonitrile (AN) and sodium styrene sulfonate (SSS) in... Acrylonitrile-sodium styrene sulfonate copolymer/layered double hydroxides nanocomposites were prepared by in situ aqueous precipitation copolymerization of acrylonitrile (AN) and sodium styrene sulfonate (SSS) in the presence of 4-vinylbenzene sulfonate intercalated layered double hydroxides (MgA1-VBS LDHs) and transferred to acrylonitrile-styrene sulfonic acid (AN-SSA) copolymer/LDHs nanocomposites as a proton-conducting polymer electrolyte. MgA1-VBS LDHs were prepared by a coprecipitation method, and the structure and composition of MgAl-VBS LDHs were determined by X-ray diffraction (XRD), infrared spectroscopy, and elemental analysis. X-ray diffraction result of AN-SSS copolymer/LDHs nanocomposites indicated that the LDHs layers were well dispersed in the AN-SSS copolymer matrix. All the AN-SSS copolymer/LDHs nanocomposites showed significant enhancement of the decomposition temperatures compared with the pristine AN-SSS copolymer, as identified by the thermogravimetric analysis. The methanol crossover was decreased and the proton conductivity was highly enhanced for the AN-SSA copolymer/LDHs nanocomposite electrolyte systems. In the case of the nanocomposite electrolyte containing 2% (by mass) LDHs, the proton conductivity of 2.60×10^- 3 S·m^-1 was achieved for the polymer electrolyte. 展开更多
关键词 acrylonitrile sodium styrene sulfonate layered double hydroxides NANOCOMPOSITE polymer electrolyte proton conductivity
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Effect of Methyl Methacrylate– Acrylonitrile -Butadiene–Styrene (MABS) on the Mechanical and Thermal Properties of Poly (Methyl Methacrylate) (PMMA)-Fly Ash Cenospheres (FAC) Filled Composites 被引量:1
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作者 M. B. Kulkarni P. A. Mahanwar 《Journal of Minerals and Materials Characterization and Engineering》 2012年第4期365-383,共19页
With the advent of plastics and the wide range of fillers that are available have made modifications as precise as the tailored resins themselves. To modify the properties of polymer either by using fillers or by prep... With the advent of plastics and the wide range of fillers that are available have made modifications as precise as the tailored resins themselves. To modify the properties of polymer either by using fillers or by preparation of polymer blends gives rise to new materials with tailored properties. More complex, three-component systems, obtained by the addition of polymeric modifier to polymer filled composites may be of interest. Use of Fly ash cenospheres is very attractive because it is inexpensive and its use can reduce the environmental pollution to a significant extent. In the present study, Poly (Methyl Methacrylate) (PMMA)-Fly ash cenospheres composites were prepared using extrusion followed by Injection molding. The effect of matrix modification with Methyl methacrylate– acrylonitrile -butadiene–styrene (MABS) on the performance of PMMA- Fly ash cenospheres compositions was also, studied. It was found that with the addition of Fly ash cenospheres particulate as filler in PMMA showed marginal reduction in Tensile Strength, % Elongation and Impact strength and improvement in Flexural Strength, Heat Deflection Temperature and Vicat Softening Point. Compared with PMMA-cenospheres composites, the notched Impact Strength of the PMMA/MABS/cenospheres composites showed marginal enhancement in values at higher loading of cenospheres. The optimum performances in mechanical and thermal properties were obtained when the ratio of MABS to cenospheres was 1:2. 展开更多
关键词 poly (Methyl Methacrylate) (PMMA) Fly ash cenospheres (FAC) Methyl methacrylate– acrylonitrile -butadiene–styrene (MABS) Mechanical and Thermal Properties.
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Study on N-Phenylmaleimide/Styrene /Acrylonitrile Copolymer Prepared by Emulsion Polymerization
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作者 Tai Huiwen, and Zhang Liucheng(Chemical Engineering Department, Hebei University of Technology, Tianjin 300130) 《河北工业大学学报》 CAS 1997年第A01期41-47,共7页
The emulsion polymerization of N-phenylmaleimide, Styrene and acrylonitrile was studied. The thermal property of this copolymer was measures by dynamic thermomechanical analysis(DMA). The mechanical properties, such a... The emulsion polymerization of N-phenylmaleimide, Styrene and acrylonitrile was studied. The thermal property of this copolymer was measures by dynamic thermomechanical analysis(DMA). The mechanical properties, such as tensile strength, hardness and fie-cural Strength were StUdied experimentally. The results indicated that not only the monomer component but also the polymerization technologies have effect on the properties of the copolymer. The optimum monomer content and suitable polymerization method were obtained. 展开更多
关键词 FIGURE acrylonitrile Copolymer Prepared by Emulsion polymerization Study on N-Phenylmaleimide/styrene
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One-pot Synthesis of 2,5-Disubstituted Oxazoles Using Poly[styrene(iodosodiacetate)] 被引量:1
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作者 JiangMinCHEN LuLingWU XianHUANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第2期143-144,共2页
Disubstituted oxazoles were prepared conveniently by treatment of aromatic -methyl ketones and nitriles with poly[styrene(iodosodiacetate)] in one-pot process.
关键词 poly[styrene(iodosodiacetate)] one-pot synthesis 2 5-disubstituted oxazoles.
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SYNTHESIS AND CHARACTERIZATION OF POLY{4-[2-(tert-BUTYLDIMETHYLSILOXY)ETHYL]STYRENE}AND ITS HYDROLYSIS DERIVATIVE 被引量:1
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作者 郭文莉 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2009年第3期399-405,共7页
The living cationic polymerization of 4-[2-(tert-butyldimethylsiloxy)ethyl]styrene (TBDMES) was studied in methylcyclohexane (MeChx)/methylchloride (MeCl) (50/50 V/V) solvent mixture at -80 degrees C. The initiator 1,... The living cationic polymerization of 4-[2-(tert-butyldimethylsiloxy)ethyl]styrene (TBDMES) was studied in methylcyclohexane (MeChx)/methylchloride (MeCl) (50/50 V/V) solvent mixture at -80 degrees C. The initiator 1,1-diphenylethylene (DPE) capped 2-chloro-2,4,4-trimethylpentane (TMPCl) was formed in situ in conjunction with titanium tetrachloride (TiCl(4)). The Lewis acidity of TiCl(4) was decreased by the addition of titanium(IV) isopropoxide (Ti(OiPr)(4)) to accomplish living polymerization of TBDMES. Hydrolysis of poly(TBDMES) in the presence of tetra-butylammonium fluoride yielded poly[4-(2-hydroxyethyl)styrene] (poly(HOES)). FT-IR, NMR and DSC demonstrated the hydrolysis was complete. 展开更多
关键词 Living carbocationic polymerization poly[4-(2-hydroxyethyl)styrene] HYDROLYSIS Pendant hydroxyl groups
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Study of Mechanical and Physical Properties of Palm Fiber Reinforced Acrylonitrile Butadiene Styrene Composite 被引量:2
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作者 Budrun Neher Md. Mahbubur Rahman Bhuiyan +3 位作者 Humayun Kabir Md. Rakibul Qadir Md. Abdul Gafur Farid Ahmed 《Materials Sciences and Applications》 2014年第1期39-45,共7页
Palm fiber (PF) reinforced acrylonitrile butadiene styrene (ABS) composite matrix was prepared by employing Injection Moulding Machine (IMM). Palm fiber was collected from ten different trees of different age group fr... Palm fiber (PF) reinforced acrylonitrile butadiene styrene (ABS) composite matrix was prepared by employing Injection Moulding Machine (IMM). Palm fiber was collected from ten different trees of different age group from Comilla region in Bangladesh. Three sets of samples were prepared for three different wt% (5%, 10% and 20%) of fiber contents. The mechanical (tensile strength, flexural stress, micro hardness, Leeb’s rebound hardness) and physical (bulk density and water absorption) properties were measured. The observed result reveals that the tensile strength (TS) and flexural stress (FS) were decreased with increasing fiber contents in the PF-ABS composites except 10% fiber content. 展开更多
关键词 acrylonitrile BUTADIENE styrene COMPOSITE Tensile STRESS Flexural STRESS Vicker’s HARDNESS and Leeb’s REBOUND HARDNESS
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Study of microstructure and flexural properties of microcellular acrylonitrile-butadiene-styrene nanocomposite foams: experimental results 被引量:3
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作者 A.MOHYEDDIN A.FEREIDOON I.TARAGHI 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2015年第4期487-498,共12页
In this paper, acrylonitrile-butadiene-styrene (ABS) nanocomposite foams are produced using carbon dioxide through the solid-state batch process. Microcellular closed-cell foams are produced with the relative densit... In this paper, acrylonitrile-butadiene-styrene (ABS) nanocomposite foams are produced using carbon dioxide through the solid-state batch process. Microcellular closed-cell foams are produced with the relative density ranging from 0.38 to 0.97. The effects of the processing conditions on the density, morphology, and flexural properties of ABS and its nanocomposite foams are studied. It is found that nanoclay particles, as nucleating sites, play an important role in reducing the size of cells and increasing their number in the unit volume of foamed polymer, as well as increasing the flexural modulus of foam through reinforcing its matrix. 展开更多
关键词 acrylonitrile-butadiene-styrene (ABS) polymer-clay nanocomposite mi-crocellular foam flexural property
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The Effects of Build Parameters and Strain Rate on the Mechanical Properties of FDM 3D-Printed Acrylonitrile Butadiene Styrene 被引量:1
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作者 Kemar Hibbert Grant Warner +3 位作者 Celeste Brown Olusegun Ajide Gbadebo Owolabi Amin Azimi 《Open Journal of Organic Polymer Materials》 2019年第1期1-27,共27页
In this paper, the effects of build parameters on the mechanical properties of 3D-printed acrylonitrile butadiene styrene (ABS) produced using fused deposition modeling (FDM) are investigated. Full factorial experimen... In this paper, the effects of build parameters on the mechanical properties of 3D-printed acrylonitrile butadiene styrene (ABS) produced using fused deposition modeling (FDM) are investigated. Full factorial experimental design incorporating a 2-level, 3-factor design with raster angle, layer thickness and interior fill style was carried out. Tensile tests were performed at four different strain rates to determine how the build parameters influence the mechanical properties of the 3-D printed ABS and to assess its strain rate sensitivity under quasi-static loading. It was found that the modulus of toughness of ABS material is most influenced by raster angle, while the interior fill style is the most dominant build parameter that dictates the specimen’s modulus of resilience, yield strength and ultimate tensile strength. At all strain rates, it is further revealed that higher mean values of yield strength, ultimate tensile strength and modulus of resilience were obtained when the interior fill style is solid as opposed to high density. This can be attributed to the denser structure and higher effective cross-sectional area in solid interior fill style in comparison with high density interior fill style. However, the influence of the layer thickness on the investigated mechanical properties was found to be inconsistent. It was noted that specimens built with both 0.254 mm layer thickness and the cross [0°/90°] raster angle had superior mechanical properties when compared to those built with the 0.3302 mm layer thickness and cross [0°/90°] raster angle. This suggests that there is a key interaction between the layer thickness and the raster angle. At any FDM build parameter, it was found that all the mechanical properties investigated in this work exhibited modest sensitivity to strain rates. This study has provided a platform for an appropriate selection of build parameters combinations and strain rates for additive manufacturing of 3D-printed ABS with improved mechanical properties. 展开更多
关键词 BUILD PARAMETERS MECHANICAL Properties Additive Manufacturing 3D Printing acrylonitrile BUTADIENE styrene
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SYNTHESIS OF MESOPOROUS POLY(STYRENE-co-MALEIC ANHYDRIDE)/SILICA HYBRID MATERIALS VIA A NONSURFACTANT-TEMPLATED SOL-GEL PROCESS 被引量:6
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作者 Jie-bin Pang Kun-yuan Qiu Yen Wei Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, USA. 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2000年第5期469-472,共4页
Mesoporous poly(styrene-co-maleic anhydride)/silica hybrid materials have been prepared. The synthesis was achieved by the HCl-catalyzed sol-gel reactions of tetraethyl orthosilicate (TEOS) and styrene-maleic anhydrid... Mesoporous poly(styrene-co-maleic anhydride)/silica hybrid materials have been prepared. The synthesis was achieved by the HCl-catalyzed sol-gel reactions of tetraethyl orthosilicate (TEOS) and styrene-maleic anhydride copolymer in the presence of 3-aminopropyl triethoxysilane (APTES) as a coupling agent and citric acid as a nonsurfactant template or pore-forming agent, followed by ethanol extraction. Characterization results from nitrogen sorption isotherms and powder X-ray diffraction indicate that polymer-modified mesoporous materials with large specific surface areas (e.g. 900 m(2)/g) and pore volumes (e.g. 0.6 cm(3)/g) could be prepared. As the citric acid concentration is increased, the specific surface areas, pore volumes and pore diameters of the hybrid materials increase. 展开更多
关键词 mesoporous hybrid material poly(styrene-co-maleic anhydride)/silica citric acid nonsurfactant template sol-gel process
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Structures and Properties Characterization of Acrylonitrile-butadiene-styrene /Organo-palygorskite Clay Composites 被引量:1
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作者 张哲 CHANG Ying +3 位作者 XU Jian WU Zhancui MA Hengchang 雷自强 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第6期1068-1071,共4页
Palygorskite (PGS) and vinyl tris-(2-methoxyethoxy) silane (KH-172) modified palygorskite (OPGS) were used to prepare acrylonitrile-butadiene-styrene (ABS)/clay composites. Thermal stability of the composite... Palygorskite (PGS) and vinyl tris-(2-methoxyethoxy) silane (KH-172) modified palygorskite (OPGS) were used to prepare acrylonitrile-butadiene-styrene (ABS)/clay composites. Thermal stability of the composites was evaluated by using thermogravimetric analysis (TGA). The morphology of the fractured surface and the degree of dispersion of the clay in the ABS matrix were observed by scanning electron microscopy (SEM). X-ray diffraction (XRD) analysis results showed the variation of the crystal structure. Measurements of the tensile properties of the ABS/clay composites proved that the ABS/OPGS composited material represented the most excellent tensile property, because of good compatibility and dispersion of ABS with OPGS. 展开更多
关键词 PALYGORSKITE acrylonitrile-BUTADIENE-styrene MODIFICATION silane coupling agents COMPOSITES
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Volatile Substances in Polymer Toys Made from Butadiene and Styrene 被引量:2
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作者 Yutaka Abe Miku Yamaguchi +2 位作者 Motoh Mutsuga Hiroshi Akiyama Yoko Kawamura 《American Journal of Analytical Chemistry》 2013年第5期229-237,共9页
The residual levels and migration behavior of volatile substances were detected using HS-GC/MS for acrylonitrile-butadiene-styrene copolymer (ABS) toys, thermoplastic elastomer toys, and rubber toys made from 1,3-buta... The residual levels and migration behavior of volatile substances were detected using HS-GC/MS for acrylonitrile-butadiene-styrene copolymer (ABS) toys, thermoplastic elastomer toys, and rubber toys made from 1,3-butadiene and styrene found on the Japanese market. The maximum residual level of these volatile substances was 2600 μg/g of styrene in ABS toys. In particular, the levels of known carcinogens 1,3-butadiene, benzene, and acrylonitrile are 5.3, 2.5 and 55 μg/g, which are much lower than the EU limit of 0.1%. Furthermore, some volatile substances migrated from ABS toys into water in amounts of 3 -40 ng/mL. Thermoplastic elastomer toys and rubber toys contained these volatile substances at significantly lower levels than ABS toys. 展开更多
关键词 VOLATILE Substance TOY acrylonitrile-BUTADIENE-styrene Copolymer (ABS) Thermoplastic Elastomer Rubber
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Molecular Imprinting Fibrous Membranes of Poly(acrylonitrile-co-acrylic acid) Prepared by Electrospinning 被引量:1
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作者 CHE Ai-fu YANG Yun-feng +2 位作者 WAN Ling-shu WU Jian XU Zhi-kang 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2006年第3期390-393,共4页
IntroductionOver the past few decades, molecular imprinting has been described as a technology for preparing "molecular doors" which can be matched to "template keys". It has been found to be a simple and effectiv... IntroductionOver the past few decades, molecular imprinting has been described as a technology for preparing "molecular doors" which can be matched to "template keys". It has been found to be a simple and effective approach to introduce specific recognition sites into synthetic polymers, namely, to create molecular imprinting polymers Remarkable features such as stability, ease of preparation and low cost, have made molecular imprinting polymers particularly attractive in chemical sensors, catalysis, drug delivery, and dedicated separations. Practical applications of molecular imprinting polymers require accessible sites, fast mass transfer, and quick binding. However, present techniques used to prepare molecular imprinting polymers most often result in materials exhibiting a high affinity and selectivity but a low capacity and poor site accessibility for the target molecules. It is also very difficult to remove the imprinted molecules located in these molecular imprinting polymers because the highly cross-linked structures do not allow the templates to move freely. To some extent, combining molecular imprinting technology with membrane separation and surface imprinting can overcome the shortcomings, such as mass transfer limitations and non-quantitative recovery of the template molecules seen for imprinted materials fabricated by conventional bulk methods. In that ease, it appears to us that molecular imprinting polymers with high surface area to volume ratios are particularly desirable for largescale applications. Eleetrospun nano and ultrafine fibrous membranes are the most suitable materials due to advantages such as: (1) large specific surfaces, providing relatively high imprinting sites per unit mass; (2) fine porous structures, resulting in the accessibility of imprinting sites and low diffusion resistance necessary for high efficiency; and (3) easy recoverability from practical operation or applicability for continuous usages. Therefore, in this work, we prepared a unique kind of imprinted material--molecularly imprinted fibrous membranes of poly ( acrylonitrile-co-acrylic acid) fabricated by means of an electrospinning process. 展开更多
关键词 Molecular imprinting ELECTROSPINNING Fibrous membrane Crystallization Surface poly acrylonitrile-co-acrylic acid)
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SYNTHESIS AND CHARACTERIZATION OF FOUR-ARMED BLOCK POLY(STYRENE-b-p-NITROPHENYL METHACRYLATE)PREPARED BY THE ATRP METHOD 被引量:1
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作者 Cai-yuan Pan Lei Tao Ye Liu Department of Polymer Science and Engineering University of Science and Technology of China, Hefei 230026 China 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2002年第4期353-360,共8页
A novel tetrafunctional initiator, C [CH_2O (CH_2)_3 OOCCH(Br)CH_3]_4 (1), was synthesized through the reaction oftetraol with α-bromopropionyl chloride, and then was used as initiator of atom transfer radical polyme... A novel tetrafunctional initiator, C [CH_2O (CH_2)_3 OOCCH(Br)CH_3]_4 (1), was synthesized through the reaction oftetraol with α-bromopropionyl chloride, and then was used as initiator of atom transfer radical polymerization (ATRP) in thepreparation of 4-armed polystyrene (PSt) with narrow polydispersity. The structure, molecular weight and molecular weightdistribution (MWD) of each arm were studied by ~1H-NMR and GPC data of hydrolyzed products of the 4-armed PSt. TheATRP of St using 1/CuBr/bpy as initiator system is of 'living' character based on the following evidence: narrow MWD,constant concentration of chain radical during the polymerization, control of molecular weight by the molar ratio of monomerconsumed to 1. The 4-armed poly(St-b-p-nitrophenyl methacrylate) [poly(St-b-NPMA)] was prepared by the ATRP ofNPMA using 4-armed PSt with terminal bromine as the initiator, and characterized by FT-IR, ~1H-NMR spectra and GPCcurves. The micelles with PSt as core, and PNPMA as shell were formed by dropping DMSO into a solution of 4-armedpoly(St-b-NPMA) in DMF, as proved by laser light scatter (LLS) method. 展开更多
关键词 Tetrafunctional initiator Atom transfer radical polymerization 4-Armed polystyrene 4-Armed poly(styrene-b-pnitrophenyl methacrylate) Unimolecular micelles
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DETERMINATION OFTHE CRYSTALLINITY IN DIFFERENT TYPE POLY (OXYETHYLENE-STYRENE)BLOCK COPOLYMERS BY X-RAY DIFFRACTION METHOD
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作者 姚宁 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1989年第4期315-321,共7页
By means of the intensity theory of X-ray scattering and the two-phase concept of high polymer, the basic formula of the crystaUinity in block copolymers has been proposed after the corrections of atomic, temperature,... By means of the intensity theory of X-ray scattering and the two-phase concept of high polymer, the basic formula of the crystaUinity in block copolymers has been proposed after the corrections of atomic, temperature, absorption, Lorentz and polarization factor. Application of this method to different type poly (oxyethylene-styrene)block copolymers and the same type block copolymers with different EO contents indicates that the crystallinity in poly (oxyethylene-styrene ) block copolymers increases with the increase of the EO content and decreases in the order: PEO-PS-PEO>PEO-PS>PS-PEO-PS. 展开更多
关键词 Crystallinity formula X-ray diffraction Block copolymers poly (oxyethylene—styrene).
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Poly[styrene(iodosodiacetate)]:An Efficient Reagent for Regioselective Azido-arylselenylation of Olefins
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作者 YouChuZHANG LuLingWU XianHUANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第5期451-452,共2页
Poly[styrene(iodosodiacetate)] reacted with diaryl diselenides, followed by sodium azide, giving 1-azido-2-arylselenoalkanes regioselectively. The polymer reagent could be regenerated and reused.
关键词 poly[styrene(iodosodiacetate)] regioselectivity azido-arylselenylation.
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Poly{[4-(hydroxyl)(tosyloxyl)iodo]styrene} Promoted Halotosyloxylation Reaction of Alkynes
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作者 JiangMinCHEN XiangJinLIN +1 位作者 LuLingWU XianHUANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第3期315-316,共2页
Halotosyloxylation reaction of alkynes with iodine or NBS or NCS was efficiently promoted by the poly{[4-(hydroxyl)(tosoyloxyl)iodo]styrene}.
关键词 poly{[4-(hydroxyl)(tosoyloxyl)iodo]styrene} halotosyloxylation reaction alkynes.
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Synthesis of Poly(styrene-co-divinylbenzene)-supported Dichloro Cyanuric Acid
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作者 ZHONG Jing fang LI Chen xi +1 位作者 HE Bing lin WU Zhi zhong 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1997年第4期126-129,共4页
SynthesisofPoly(styrene┐co┐divinylbenzene)┐supportedDichloroCyanuricAcidZHONGJing-fang*,LIChen-xi,HEBing-lin... SynthesisofPoly(styrene┐co┐divinylbenzene)┐supportedDichloroCyanuricAcidZHONGJing-fang*,LIChen-xi,HEBing-linandWUZhi-zhong(St... 展开更多
关键词 Microbicidal agent for natural water poly(styrene co divinylbenzene) supported dichlorouric acid Trichlorocyanuric acid
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Development of Urease Immobilization Using Poly(acrylonitrile)/Chitosan Composite Materials
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作者 Komvalal Panpae Noppol Wiyok Narath Kanthiwivorn 《Journal of Chemistry and Chemical Engineering》 2012年第8期726-731,共6页
PANCHI (poly(acrylonitrile)/chitosan) composite membranes were prepared. The chitosan layer was deposited on the surface as well as on the pore walls of the base membrane. This resulted in the reduction of the por... PANCHI (poly(acrylonitrile)/chitosan) composite membranes were prepared. The chitosan layer was deposited on the surface as well as on the pore walls of the base membrane. This resulted in the reduction of the pore size of the membrane and in an increase of their hydrophilicity. The pore structure of poly(acrylonitrile) and PANCHI membranes were determined by SEM analyses It was found that the membrane coated with 1.0% chitosan shows the maximum reduced pore size. The amounts of the functional groups and the degree of hydrophilicity of PANCHI composite membranes were determined. Urease was covalently immobilized onto all kinds of PANCHI membranes using glutaraldehyde. Both the amount of bound protein and relative activity of immobilized urease were measured. The highest activity (92.96%) was measured for urease bound to PANCHI (1%) membranes. The basic characteristics of optimum conditions (pH and temperature), heat inactivation and storage stability of immobilized urease were determined. Immobilization improved the thermal, pH and storage stability of the enzyme. The obtained results show that the poly(acrylonitrile)/chitosan composite materials are suitable for urease immobilization. 展开更多
关键词 Urease immobilization polyacrylonitrile CHITOSAN composite materials.
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Poly Ethylene Glycols as Efficient Media for the Synthesis of <i>β</i>-Nitro Styrenes from <i>α</i>, <i>β</i>-Unsaturated Carboxylic Acids and Metal Nitrates under Conventional and Non-Conventional Conditions
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作者 Kamatala Chinna Rajanna Kola Ramesh +3 位作者 Soma Ramgopal Somannagari Shylaja Pochampally Giridhar Reddy Pondichery Kuppuswamy Saiprakash 《Green and Sustainable Chemistry》 2011年第4期132-148,共17页
Poly ethylene glycols (PEG-200, 400, 600, 4000 and 6000) supported reactions were conducted with certain α, β-unsaturated acids in presence of metal nitrates under solvent free (solid state) and mineral acid free co... Poly ethylene glycols (PEG-200, 400, 600, 4000 and 6000) supported reactions were conducted with certain α, β-unsaturated acids in presence of metal nitrates under solvent free (solid state) and mineral acid free conditions. The reactants were ground in a mortar with a pestle for about 30 minutes. The aromatic acids underwent nitro decarboxylation and afforded β-nitro styrene derivatives in very good yield while α, β-unsaturated aliphatic carboxylic acids gave corresponding nitro derivatives. Addition of PEG accelerated rate of the reaction enormously. Reaction times substantially decreased from several hours to few minutes followed by highly significant increase in the product yield. Among the several PEGs PEG-300 has been found to be much more effective than other PEGs. 展开更多
关键词 poly Ethylene Glycols (PEG) Rate Accelerations α β-Unsaturated ACIDS Metal Nitrates Solvent Free (Solid State) β-Nitro styrene DERIVATIVES β-Unsaturated Aliphatic ACIDS NITRO DERIVATIVES
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