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Research on the Marine Antifouling Ability and Mechanism of Acrylate Copolymers and Marine Coatings Based on a Synergistic Effect
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作者 ZHOU Wenjun ZHOU Yu +4 位作者 NI Chunhua YU Liangmin YUAN Zhengjun LI Changcheng YAN Xuefeng 《Journal of Ocean University of China》 SCIE CAS CSCD 2023年第3期717-727,共11页
Marine biofouling is an urgent global problem in the process of ocean exploitation and utilization.In our work,a series of zinc-based acrylate copolymers(ACZn-x)were designed and synthesized using benzoic acid,zinc ox... Marine biofouling is an urgent global problem in the process of ocean exploitation and utilization.In our work,a series of zinc-based acrylate copolymers(ACZn-x)were designed and synthesized using benzoic acid,zinc oxide(ZnO)and a random quaternion copolymer consisting of ethyl acrylate(EA),butyl acrylate(BA),acrylic acid(AA)and methacrylic acid(MAA)by free radical polymerization and dehydration condensation.The ACZn-x with a zinc benzoate side chain is able to hydrolyze in natural seawater under static conditions,resulting in the formation of a smooth surface.We investigated and confirmed the antifouling(AF)behavior of ACZn-x in the laboratory and revealed that they have better antibacterial(86%for S.aureus and 72%for E.coli)and anti-algal(≥60.1%for N.closterium and≥67.5%for P.subcordiformis)activities.We also assessed the marine AF properties of ACZn-x and corresponding coatings in Qingdao,China;the ACZn-x exhibited ideal AF properties with little silt and biological mucosa adhered to the ACZn-x surface after 6 months,and corresponding coatings exhibited little biofouling after 16 months in the ocean.Importantly,possible AF mechanisms were further proposed at the cellular level.These results could be helpful for the development and application of effective AF coatings. 展开更多
关键词 zinc-based acrylate copolymer self-polishing marine antifouling MECHANISM
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PHOTO-INDUCED DOPED POLYANILINE BY THE VINYLIDENE CHLORIDE AND METHYL ACRYLATE COPOLYMER AS PHOTO ACID GENERATOR 被引量:1
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作者 李素珍 万梅香 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1997年第2期108-113,共6页
The emeraldine base form of polyaniline (PANI) can be doped by a photo-induced doping method. In this method a. copolymer of vinylidene chloride and methyl acrylate (VCMAC) was used as photo acid generator which can r... The emeraldine base form of polyaniline (PANI) can be doped by a photo-induced doping method. In this method a. copolymer of vinylidene chloride and methyl acrylate (VCMAC) was used as photo acid generator which can release proton when it is exposed to ultraviolet light (lambda = 254 nm). The structure of PANI-VCMAC system before and after irradiation was characterized by elemental analysis, IR, XTP, anti SEM images. Results obtained indicate that the photo-induced doping characteristics, such as doping position and type of charge carriers, are similar to that of PANI doped with HCl. The poor room-temperature conductivity (similar to 10-S-5/cm) of PANI-VCMAC system after irradiation may be due to low doping degree (similar to pH=3) and the difference in morphology as compared with PANI-HCl film. 展开更多
关键词 POLYANILINE photo-induced doping vinylidene chloride and methyl acrylate copolymer (VCMAC) photo acid generator
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EFFECT OF TEMPERATURE ON COPOLYMERIZATION PARAMETERS OF HYDROXYETHYL ACRYLATE AND METHYL METHACRYLATE
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作者 李欣欣 印啸敏 +2 位作者 吴平平 韩哲文 朱清仁 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1998年第1期25-31,共7页
The copolymerization of 2-hydroxyethyl acrylate (HEA, M//1) and methyl methacrylate (MMA, M//2) in cyclohexanone was studied. The multiple experiments of solution copolymerization with low conversion were carried out... The copolymerization of 2-hydroxyethyl acrylate (HEA, M//1) and methyl methacrylate (MMA, M//2) in cyclohexanone was studied. The multiple experiments of solution copolymerization with low conversion were carried out at two sensitive composition feed points at 60, 80, 100, 120 and 140 degree C, respectively. The composition of the copolymers was analyzed by **1H-NMR. The reactivity ratios which were estimated by the Error-in-Variable Method (EVM) of Mayo-Lewis equation were found to be r//1 equals 0.328, r//2 equals 1.781 for 60 degree C; 0.375, 1.709 for 80 degree C; 0.406, 1.654 for 100 degree C; 0.439, 1.540 for 120 degree C and 0.455, 1.400 for 140 degree C, and the 95% joint confidence intervals of the reactivity ratios were also determined. According to r//1 and r//2, Arrhenius relations and the activity energy difference between the homo- and cross-propagation were calculated. (Author abstract) 12 Refs. 展开更多
关键词 reactivity ratio 2-Hydroxyethyl acrylate methyl methacrylate copolymerIZATION copolymer composition
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BARRIER PROPERTIES OF VINYLIDENE CHLORIDE/METHYL ACRYLATE COPOLYMER
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作者 李悦生 翁志学 潘祖仁 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1997年第4期319-324,共6页
A series of vinylidene dichloride (VDC) copolymers with methyl acrylate (MA) as comonomer (3-12wt%), was prepared by free-radical suspension copolymerization. The permeability coefficients of the copolymers to oxygen ... A series of vinylidene dichloride (VDC) copolymers with methyl acrylate (MA) as comonomer (3-12wt%), was prepared by free-radical suspension copolymerization. The permeability coefficients of the copolymers to oxygen and carbon dioxide were measured at 1.0 MPa and at 30 degrees C, and those to water vapor were measured at 30 degrees C and 100% relative humidity. All the VDC/MA copolymers studied are semicrystalline. As the MA content increases, the permeability coefficients of the copolymers to oxygen, carbon dioxide, and water vapor are progressively increased, caused by decrease in crystalline fraction and increase in free volume of VDC/MA copolymers. 展开更多
关键词 barrier properties copolymer films vinylidene chloride methyl acrylate
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EFFECTS OF ω-ACRYLOYL POLY (ETHYLENE OXIDE) MACROMONOMER ON EMULSIFIER-FREE EMULSI0N COPOLYMERIZATION OF METHYL METHACRYLATE AND n-BUTYL ACRYLATE
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作者 郭天瑛 宋谋道 +2 位作者 周庆业 郝广杰 张邦华 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1998年第4期351-355,共5页
Well-defined nonionic hydrophilic ω-acryloyl poly(ethylene oxide) macro-monomer (PEO-A) has been prepared by living anionic polymerization of ethylene oxidewith diphenyl methyl potassium as the initiator and acryloyl... Well-defined nonionic hydrophilic ω-acryloyl poly(ethylene oxide) macro-monomer (PEO-A) has been prepared by living anionic polymerization of ethylene oxidewith diphenyl methyl potassium as the initiator and acryloyl chloride as the reaction termi-nating agent. The polymer was characterized by FTIR and SEC. The emulsifier-free emul-sion polymerization of methyl methacrylate (MMA) and n-butyl acrylate (BA) containingvarious concentrations of PEO-A was studied. In all cases stable emulsion coplymerizationsof MMA and BA were obtained. The stabilizing effect was found to be dependent on themolecular weight and the feed amount of the macromonomer. 展开更多
关键词 MACROMONOMER ω-acryloyl poly(ethylene oxide) Emulsifier-free emulsion copolymerization Methyl methacrylate-n-butyl acrylate copolymer
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Effect of the Side Chain Structure on Hydrolysis Degradation of Zinc Acrylate Copolymers
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作者 XIE Zhi-peng LIU Chao +1 位作者 WANG Jing-jing YE Zhang-ji 《腐蚀与防护》 北大核心 2012年第S1期44-48,共5页
In this report,zinc acrylate copolymers were synthesized by used different organic acid as the side chain structure.These copolymers were further characterized by GPC,DSC and Water absorption analysis respectively,and... In this report,zinc acrylate copolymers were synthesized by used different organic acid as the side chain structure.These copolymers were further characterized by GPC,DSC and Water absorption analysis respectively,and then the effects of the chain structure of organic acid on hydrolysis degradation and copper release rate were also discussed.In the meantime,the result shows that the biocide release rate could be controlled by used different chain structure of organic acid. 展开更多
关键词 self-polishing organic acid zinc acrylate copolymers ANTIFOULING
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Investigation on Mechanical Properties of CMSLDS/Acrylate Copolymeric Blending Films for Warp Sizing
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作者 乔志勇 祝志峰 张斌 《Journal of Donghua University(English Edition)》 EI CAS 2010年第1期36-40,共5页
Carboxymethyl starch with lower degree of substitution was, blended with acrylate copolymer for revealing the relation between mechanical properties and chemical structure of blending film. Effects of carboxymethy... Carboxymethyl starch with lower degree of substitution was, blended with acrylate copolymer for revealing the relation between mechanical properties and chemical structure of blending film. Effects of carboxymethylation of starch, acrylate constituent units of acrylate copolymers, and copolymer content of the film on the properties were investigated. The mechanical properties were evaluated in terms of tensile strength, breaking elongation, abrasion resistance, and flex-fatigue resistance. Film morphology was examined with X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscope (AFM). It was found that the properties depended on the degree of substitution of carboxymethyl starch, chemical structure of acrylate units, and content of acrylate copolymer. Phase-separation of the two ingredients occurred within film matrix and the separation was decreased after starch carboxymethylation. Breaking elongation and flex-fatigue resistance of the film reached maximmns when acrylate copolymer content was 50%. Excessively increasing the content of acrylate copolymer reduced the film properties. 展开更多
关键词 carboxymethyl starch acrylate copolymer blending film mechanical properties degree of substitution
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Removal of manganese from waste water by complexation-ultrafiltration using copolymer of maleic acid and acrylic acid 被引量:2
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作者 邱运仁 毛廉君 王伟华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第4期1196-1201,共6页
Copolymer of maleic acid and acrylic acid (PMA-100), combining with polyvinyl butyral (PVB) ultrafiltration membrane was used for the removal of Mn(II) from waste water by complexation-ultrafiltration. The carbo... Copolymer of maleic acid and acrylic acid (PMA-100), combining with polyvinyl butyral (PVB) ultrafiltration membrane was used for the removal of Mn(II) from waste water by complexation-ultrafiltration. The carboxylic group content of PMA-100 and the rate of complexation reaction were measured. Effects of the mass ratio of PMA-100 to Mn(II) (n), pH, background electrolyte, etc on the rejection rate (R) and permeate flux (J) were investigated. The results show that carboxylic group content of PMA-100 is 9.5 mmol/g. The complexation of Mn(II) with PMA-100 is rapid and completed within 5 min at pH 6.0. Both R and J increase with pH increasing in the range of 2.5-7.0, and R increases with the increase of n at pH 6.0 while J is little affected. The background electrolyte leads to the decrease of R, and CaCl2 has much greater effect on R than NaCl at the same ionic strength. 展开更多
关键词 complexation-ultrafitration copolymer of maleic acid and acrylic acid poly (vinyl butyral) hollow fiber membrane MANGANESE wastewater treatment
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PREPARATION AND SURFACE PROPERTIES OF ACRYLIC COPOLYMERS CONTAINING FLUORINATED MONOMERS 被引量:1
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作者 Tai-jiang Gui Hao Wei +3 位作者 Ying Zhao Xiu-lin Wang Du-jin Wang Duan-fu Xu 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2006年第6期575-578,共4页
A series of copolymers comprising butylmethacrylate, styrene, butylacrylate, hydroxypropyl acrylate and perfluoroalkyl methacrylate were synthesized by the free radical polymerization using BPO as an initiator. The su... A series of copolymers comprising butylmethacrylate, styrene, butylacrylate, hydroxypropyl acrylate and perfluoroalkyl methacrylate were synthesized by the free radical polymerization using BPO as an initiator. The surface property of the copolymer films was subsequently characterized. The contact angle measurements and energy dispersive analysis of X-ray (EDAX) show that the length and content of perfluoroalkyl side chains in the copolymers are crucial for the preparation of the film with low surface energy. At a given content of fluorinated monomers in the copolymers, the longer the perfluoroalkyl side chain, the larger the water contact angle of the copolymer films will be. On the other hand, the higher the content of fluorinated monomers, the lower the surface energy is. The water contact angle increases with the increase of the fluorinated monomer content and reaches a plateau at 3 wt% of fluorinated monomer content. 展开更多
关键词 acrylate copolymers Fluorinated monomers Surface property Contact angle X-ray energy dispersive analysis.
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Effect of Structural Units on the Adhesion of Acrylic Copolymers to Fibers for Warp Sizing 被引量:1
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作者 祝志峰 许德生 徐珍珍 《Journal of Donghua University(English Edition)》 EI CAS 2010年第6期825-829,共5页
Radical copolymerization of acrylic acid(AA)with acrylamide(AM)or acrylamide/acrylonitrile(AM/AN)was initiated with ammonium persulfate as initiator to produce acrylic copolymers such as bicopolymer poly(AM-co-AA)and ... Radical copolymerization of acrylic acid(AA)with acrylamide(AM)or acrylamide/acrylonitrile(AM/AN)was initiated with ammonium persulfate as initiator to produce acrylic copolymers such as bicopolymer poly(AM-co-AA)and tercopolymer poly(AM-co-AN-co-AA)for revealing the effects of the structural units of the copolymers on the adhesion of the copolymers to polyester or cotton fibers for warp sizing.The adhesion was evaluated in terms of tensile strength and work-to-break of a roving impregnated with the copolymer solution.It was found that the adhesion strongly depended on type and amount of the units incorporated into the copolymeric chains.Whether the fiber is cotton or polyester,the adhesion of the bicopolymer poly(AM-co-AA)is greater than that of polyacrylic acid or polyacyamide.Excessively increasing the amount of AM or AA unit in poly(AM-co-AA)lowers the adhesion.To enhance the adhesion of the bicopolymer,a favorable mole ratio of AM to AA is 70/30.Based on this mole ratio,incorporation of acrylonitrile units into poly(AM-co-AA)to form tercopolymer enhances the adhesion. 展开更多
关键词 acrylic copolymers warp sizes structural units ADHESION
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BARRIER PROPERTY AND STRUCTURE OF ACRYLONITRILE/ACRYLIC COPOLYMERS
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作者 杨正华 李悦生 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1997年第3期236-241,共6页
A series of acrylonitrile (AN) copolymers with methyl acrylate (MA) or ethyl acrylate (EA) as comonomer (5-23 wt%) was prepared by free-radical copolymerisation. The permeability coefficients of the copolymers to oxyg... A series of acrylonitrile (AN) copolymers with methyl acrylate (MA) or ethyl acrylate (EA) as comonomer (5-23 wt%) was prepared by free-radical copolymerisation. The permeability coefficients of the copolymers to oxygen and carbon dioxide were measured at 1.0 MPa and at 30 degrees C, and those to water vapor also measured at 100% relative humidity and at 30 degrees C. All the AN/acrylic copolymers are semicrystalline. As the acrylate content increase, the permeability coefficients of the copolymers to oxygen and carbon dioxide are increased progressively, but those to water vapor are decreased progressively. The gas permeability coefficients of the polymers were correlated with free-volume fractions or the ratio of free volume to cohesive energy. 展开更多
关键词 barrier property copolymer film acrylONITRILE methyl acrylate ethyl acrylate
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An Approach to the Flame Retardancy of EVA Copolymer by Plasma Treatmentc2
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作者 施来顺 王建祺 《Journal of Beijing Institute of Technology》 EI CAS 1997年第4期17-24,共8页
An attempt was made in the paper aiming at imparting flame retardancy to polymers by plasma grafting technique Based on EVA copolymers with different VA contents the author tried to use the Ar plasma followed by graf... An attempt was made in the paper aiming at imparting flame retardancy to polymers by plasma grafting technique Based on EVA copolymers with different VA contents the author tried to use the Ar plasma followed by grafting with/without subsequent saponification and metal ion exchange expediting the charring of polymers upon heationg Characterization of the flammability of the plasma treated EVA copolymers grafted with acrylic monomers(MAA,AA and AAm)indicates that this approach turns out to be a promising way and worthy doing whatever in research and/or applications 展开更多
关键词 flame retardancy surface grafting plasma EVA copolymer methylacrylic acid acrylic acid acrylAMIDE
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Synthesis and application of lignin-based copolymer LSAA on controlling non-point source pollution resulted from surface runoff 被引量:8
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作者 LIU Chen WU Guangxia MU Huanzhen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第7期820-826,共7页
In this article,alkali lignin separated from paper pulp waste was grafted into a novel copolymer LSAA (a copolymer of lignin,starch, acrylamide,and acrylic acid).Its practical application effect and environmental safe... In this article,alkali lignin separated from paper pulp waste was grafted into a novel copolymer LSAA (a copolymer of lignin,starch, acrylamide,and acrylic acid).Its practical application effect and environmental safety were studied.The results of field simulation experiment indicated that the application of LSAA significantly affected the output of the runoff and pollutants.The runoff quantity was decreased by 16.67%-47.00%and the loads of total suspended solids (TSS),chemical oxygen demand (COD),total nit... 展开更多
关键词 application copolymer a copolymer of lignin STARCH acrylamide and acrylic acid (LSAA) non-point source pollution (NPS) surface runoff
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Comparison of selective flocculation of low grade goethitic iron ore fines using natural and synthetic polymers and a graft copolymer 被引量:4
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作者 Kichakeswari Tudu Sagar Pal N.R.Mandre 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第5期498-504,共7页
This study aims to beneficiate low grade goethitic iron ore fines using a selective flocculation process. Selective flocculation studies were conducted using different polymers such as starch amylopectin(AP), poly acr... This study aims to beneficiate low grade goethitic iron ore fines using a selective flocculation process. Selective flocculation studies were conducted using different polymers such as starch amylopectin(AP), poly acrylic acid(PAA), and a graft copolymer(AP-g-PAA). The obtained results were analyzed; they indicate the enhancement of the iron ore grade from 58.49% to 67.52% using AP-g-PAA with a recovery of 95.08%. In addition, 64.45% Fe with a recovery of 88.79% was obtained using AP. Similarly, using PAA, the grade increased to 63.46% Fe with a recovery of 82.10%. The findings are also supported by characterizing concentrates using X-ray diffraction(XRD) and electron probe microanalysis(EPMA) techniques. 展开更多
关键词 low grade iron ore FINES selective FLOCCULATION GRAFT copolymer amylopectin(AP) poly acrylIC acid(PAA)
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Synthesis and Properties of Poly (n-Octyl Acrylate) with Uniform Polystyrene Grafts
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作者 廖桂英 姜胜斌 《Journal of China University of Geosciences》 SCIE CSCD 2007年第2期153-157,共5页
Poly (n-octyl acrylate) with uniform polystyrene grafts (POA-g-PS) was obtained by radical copolymerization of n-octyl acrylate (OA) with PS macromer, in solution. The reactivity ratio and effects of copolymeriz... Poly (n-octyl acrylate) with uniform polystyrene grafts (POA-g-PS) was obtained by radical copolymerization of n-octyl acrylate (OA) with PS macromer, in solution. The reactivity ratio and effects of copolymerization conditions on grafting efficiency were studied. The crude products were purified by extraction with cyclohexane and n-butanol successively. POA-g-PS exhibited a very good compatibilizing effect on the acrylic rubber/polystyrene blends. 2﹪-3﹪ of the graft copolymer was enough for enhancing the tensile strength of the blends. DSC and SEM demonstrated the enhancement of compatibility in the presence of the graft copolymer. 展开更多
关键词 graft copolymer PS macromer n-octyl acrylate blend COMPATIBILIZER
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NANOSTRUCTURES OF FUNCTIONAL BLOCK COPOLYMERS
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作者 Guojun Liu Department of Chemistry, University of Calgary, 2500 University Dr., NW, Calgary, Alberta, Canada T2N IN4 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2000年第3期255-262,共8页
Nanostructure fabrication from block copolymers in my group normally involves polymer design, synthesis, self-assembly, selective domain crosslinking, and sometimes selective domain removal. Preparation of thin films ... Nanostructure fabrication from block copolymers in my group normally involves polymer design, synthesis, self-assembly, selective domain crosslinking, and sometimes selective domain removal. Preparation of thin films withnanochannels was used to illustrate the strategy we took. In this particular case, a linear triblock copolymer polyisoprenc-block-poly(2-cinnamoylethyl methacrylate)-block-poly(t-butyl acrylate), PI-b-PCEMA-b-PtBA, was used. Films, 25 to50 μm thick, were prepared from casting on glass slides a toluene solution of PI-b-PCEMA-b-PtBA and PtBA homopolymer,hPtBA, where hPtBA is shorter than the PtBA block. At the hPtBA mass faction of 20% relative to the triblock or the totalPtBA (hPtBA and PtBA block) volume fraction of 0.44, hPtBA and PtBA formed a seemingly continuous phase in the matrixof PCEMA and Pl. Such a block segregation pattern was locked in by photocrosslinking the PCEMA domain. Nanochannelswere formed by extracting out hPtBA with solvent. Alternatively. larger channels were obtained from extracting out hPtBAand hydrolyzing the t-butyl groups of the PtBA block. Such membranes were not liquid permeable but had gas permeabilityconstants ~6 orders of magnitude higher than that of low-density polyethylene films. 展开更多
关键词 NANOSTRUCTURES Block copolymers Nanochannel generation Self-Assembly Polyisoprene-b-poly(2-cinnanoylethyl methacrylate)-b-poly(t-butyl acrylate)
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Synthesis and Performances of Poly(2-ethylhexyl acrylate-co-acrylic acid) Used for Warp Sizing
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作者 祝志峰 高林林 +1 位作者 王其 乔志勇 《Journal of Donghua University(English Edition)》 EI CAS 2011年第5期511-515,共5页
A series of poly ( 2-ethylhexyl acrylate-co-acrylic acid ) s ( P (2-EHA-co-AA) )s with different mole contents of 2-ethylhexyl acrylate ( 2-EHA ) were synthesized through free radical copolymerization in ethan... A series of poly ( 2-ethylhexyl acrylate-co-acrylic acid ) s ( P (2-EHA-co-AA) )s with different mole contents of 2-ethylhexyl acrylate ( 2-EHA ) were synthesized through free radical copolymerization in ethanol for investigating the influences of copolymer composition upon the performance such as apparent viscosity, film behaviors, and adhesion to fibers for warp sizing. The content of 2-EHA was varied from 80 % to 40 %. The adhesion was estimated by measuring tensile strength and work-to-break of impregnated roving. The film behaviors were evaluated in terms of breaking strength, breaking elongation, work-to-break, and flex- fatigue resistance. It was observed that the viscosity, adhesion, and film behaviors of the copolymers strongly depended on the content of 2-EHA. Excessively increasing or decreasing the content of 2-EHA units incorporated into the copolymeric chains reduces the serviceability of P(2-EHA-co-AA) in warp sizing. The adhesion and film behaviors of the copolymcr reach their maximal values at mole content of 50 % simultaneously. Therefore, the copolymer used as sizing agent should be synthesized under equal mole of 2-EHA and AA in monomer formulation. 展开更多
关键词 warp sizing agents 2-ethylhexyl acrylate copolymer copolymer composition ADHESION film behavior
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Solvent-Induced Phase-Inversion and Electrical Actuation of Dielectric Copolymer Films
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作者 Yeonju Jang Toshihiro Hirai 《Materials Sciences and Applications》 2011年第3期187-195,共9页
Block copolymers posses inherently the ability of form a variety of phase-separated microdomain structures. The lengths of block segments and the selectivity of the solvent are primary factors affecting the resultant ... Block copolymers posses inherently the ability of form a variety of phase-separated microdomain structures. The lengths of block segments and the selectivity of the solvent are primary factors affecting the resultant morphology. This paper investigated the effect of casting solvents on the morphologies and electrical actuation of poly(methyl methacrylate)-poly(n-butyl acrylate)-poly(methyl methacrylate) (PMMA-PnBA-PMMA) triblock copolymer films comprising PMMA hard segment and PnBA soft segment. Transmission electron microscopy and confocal laser scanning microscopy observation revealed that PMMA and PnBA segments were assembled into various micro- and nano-sized phase structures where either of them formed continuous phase. This implies that continous phase could be inversed by used casting solvents. Solvent-dependent phase morphologies had a significant effect on the electrical actuation results. Increase of the PnBA contents and the continuous phases of PnBA soft segments improved both of electrical actuation and dielectric constant, indicating that solvent-induced phase separation modulates the electrical actuation of dielectric films. The significance of the role of solvent selectivity and the major continuous phase of the polymer in defining the morphology and electrical actuation of the self-assembled block copolymer structure are discussed. 展开更多
关键词 Actuator acrylIC TRIBLOCK copolymers ELECTRICAL ACTUATION DIELECTRIC Properties
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3D打印工艺参数对PLA/PTW共混物力学性能影响的研究 被引量:1
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作者 马秀清 劳志超 +2 位作者 李明谦 韩顺涛 胡楠 《中国塑料》 CAS CSCD 北大核心 2024年第2期70-75,共6页
采用3D打印中的熔融沉积成型(FDM)工艺制备了聚乳酸/乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯共聚物(PLA/PTW),通过单因素实验探究了3D打印工艺参数(喷头温度、打印平台温度和打印速度)对PLA/PTW共混物力学性能的影响,并在此基础上设计了... 采用3D打印中的熔融沉积成型(FDM)工艺制备了聚乳酸/乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯共聚物(PLA/PTW),通过单因素实验探究了3D打印工艺参数(喷头温度、打印平台温度和打印速度)对PLA/PTW共混物力学性能的影响,并在此基础上设计了三因素三水平正交实验,优化了3D打印的工艺参数。结果表明,共混物的冲击强度和拉伸强度均随喷头温度的增加呈现先上升后下降、均随打印平台温度的增加而增加、均随打印速度的增加出现下降的趋势。各工艺参数对PLA/PTW共混物综合力学性能的影响从大到小依次为:喷头温度、打印速度、打印平台温度,且当喷头温度为210℃、打印平台温度为80℃以及打印速度为40 mm/s时,打印出的PLA/PTW共混物的综合力学性能最佳。 展开更多
关键词 3D打印 聚乳酸/乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯共聚物 力学性能
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乙烯-丙烯酸及酯共聚物的结构研究
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作者 杜文博 沈禾雨 +3 位作者 郭森 张悦 刘振宇 蒋文军 《中国胶粘剂》 CAS 2024年第10期62-66,共5页
为进一步探究自由基聚合与配位共聚得到乙烯-丙烯酸甲酯共聚物的支链结构差异,并对该支链结构差异性的本质原因进行解释,本研究对进口的乙烯-丙烯酸及酯共聚物的熔点、熔指、分子量、极性单体插入率以及共聚物的微观链结构进行表征分析... 为进一步探究自由基聚合与配位共聚得到乙烯-丙烯酸甲酯共聚物的支链结构差异,并对该支链结构差异性的本质原因进行解释,本研究对进口的乙烯-丙烯酸及酯共聚物的熔点、熔指、分子量、极性单体插入率以及共聚物的微观链结构进行表征分析。研究结果表明:(1)乙烯-丙烯酸及酯共聚物熔点范围为64.1~98.4℃,熔融指数范围为2.81~10.50 g/10 min。EMA、EEA、EBA的重均分子量(Mw)都在20万左右,分子量分布(M_(w)/M_(n))小于5.0。(2)EMA共聚物中极性单体MA是以支链末端和主链两种形式并存于聚乙烯链上,其中以支链末端为主。MA在聚乙烯链中没有连续插入结构,MA主要以无规形式插入聚乙烯中。(3)进口的EMA共聚物是通过高温高压自由基聚合得到,EMA共聚物链中含有丁基、戊基以及长支链,而配位聚合得到的EMA共聚物含有甲基、乙基、丙基等短支链以及长支链。两种聚合方式得到EMA聚合物的微观链结构存在明显差异。 展开更多
关键词 乙烯-丙烯酸及酯共聚物 半结晶性 结构 表征
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