POLYMER ENGINEERING AND SCIENCE
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2018
·Vol. 59
·期 2
·389-395
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IF 1.551
Jie Huang,Yingwu Luo,Xiang Gao
Acrylonitrile-styrene-acrylate (ASA) toughened plastics based on block copolymers are successfully prepared via RAFT emulsion polymerization and various molecular structures are designed to have different morphologies in order to investigate the relationship between morphologies and mechanical properties. All materials prepared by blending exhibit sea-island morphology. Promoting particles dispersion and increasing spherical particle size shorten surface-to-surface interparticle distance and help to improve tensile properties of materials. Enlarging particles through crosslinked structures are found to be a more effective method to improve tensile toughness, at the cost of a slight reduction in tensile yield strength. Larger spherical particles with crosslinked structures are found to help improving the Izod notched impact strength of materials. However, the existence of a SAN core decreases the material's ability to withstand impact. Compared to blended samples, triblock copolymer materials display higher flexural strength with equal flexural modulus. POLYM. ENG. SCI., 59:389–395, 2019. © 2018 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2013
·Vol. 54
·期 1
·59-63
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IF 1.243
Guangren Yu,Qingzeng Li,Na Li,Ziwei Man,Chenghao Pu,Charles Asumana,Xiaochun Chen
A new poly(ionic liquid) of N , N -methylenebisacrylamide (MBA)-crosslinked-poly(4-vinylbenzyltriethylammonium hexafluorophosphate)(MBA-crosslinked-P[VBTEA][PF 6 ]) is prepared through the ion exchange of KPF 6 with the precursor of MBA-crosslinked-P[VBTEA][Cl]; the precursor is synthesized by 4-vinylbenzyltriethylammonium chloride and MBA via inverse suspension polymerization. MBA-crosslinked-P[VBTEA][PF 6 ] is a thermally stable (decomposes at nearly 300°C) and porous (apparent porosity of 64.3% and specific surface of 39.12 m 2 /g) polymer particle with high purity, as indicated by Fourier transformed infrared, energy dispersive spectroscopy, thermogravimetric, scanning electron microscopy, and porous analyses. It is observed that MBA-crosslinked-P[VBTEA][PF 6 ] has good CO 2 adsorption capability of 14.04 mg/g at 0.2 MPa and 25°C, and can be recovered by desorption at vacuum and 80°C, and reused with 99% CO 2 adsorption after four cycles. POLYM. ENG. SCI., 54:59–63, 2014. © 2013 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2014
·Vol. 55
·期 1
·8-13
·
IF 1.441
Tian Lan,Wenjie Yang,Juan Peng,Mingke Li,Yinghan Wang
The article aimed to decrease the memory effect of polymer dispersed liquid crystals (PDLCs) films, reversible additional-fragmental chain transfer (RAFT) polymerization was used to synthesize RAFT-polystyrene (RAFT-PS), which was a kind of RAFT macroinitiators and used to prepare PDLCs via photo polymerization induced phase separation (PIPS). Different RAFT agents were used to synthesize RAFT-PS. The effect of photoinitiator concentration on the memory effect of these PDLCs was investigated, and the effect of structures of RAFT macroinitiators on the memory effect of the PDLCs was also discussed. The results showed that PDLC films with higher photoinitiator concentration and polymer matrix which had two rigid chains in two ends showed lower memory effect, which could be reduced from 10.9% to 2.5% in this experiment. POLYM. ENG. SCI., 55:8–13, 2015. © 2014 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2013
·Vol. 54
·期 11
·2595-2604
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IF 1.243
Huan Wang,Jingzhao Mo,Baoqing Shentu,Zhixue Weng
The multiepoxy-terminated low-molecular-weight poly (phenylene oxide) (PPOE) was synthesized by modifying the terminal hydroxyl group of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) with epoxy-novolac resin (EPN). The curing kinetics, phase morphology, and thermal stability of the cured EPN/PPOE blends were investigated and compared to the unmodified EPN/PPO and EPN/EPPO (epichlorohydrin-modified PPO) blends. As revealed by the Fourier transform infrared and differential scanning calorimetry analyses, PPOE took part in the curing reaction and formed a crosslinked structure with EPN. The curing rate of EPN/PPOE blends first increased and then decreased with the increase of PPOE fraction. PPOE had both catalytic and steric hindrance effects on the curing reaction. EPN/PPOE blends showed faster curing rate and higher degree of curing than the corresponding EPN/PPO and EPN/EPPO blends. The reactive blending improved the dispersion of PPOE in EPN matrix and the thermal stability of the blend. POLYM. ENG. SCI., 54:2595–2604, 2014. © 2013 Society of Plastics Engineers
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POLYMER ENGINEERING AND SCIENCE
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2015
·Vol. 55
·期 12
·2829-2837
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IF 1.52
Shushan Yuan,Juan Wang,Xiaojun Wang,Shengru Long,Gang Zhang,Jie Yang
Poly(arylene sulfide sulfone) (PASS) is a kind of newly developed polymeric membrane material which has excellent mechanical strength, thermal stability, and solvent resistance. And, it would be a potential material for high temperature ultrafiltration and organic solvent filtration. In this article, PASS hybrid ultrafiltration membrane with improved antifouling property was prepared by mixing TiO 2 nanoparticles which were grafted with polyacrylic acid (PAA). These membranes were prepared by a phase inversion technique and their separation performance and antifouling property of the prepared membranes were investigated in detail by SEM, FTIR, EDS, contact angle goniometry, filtration experiments of water, and BSA solution. The results shown that the TiO 2 - g -PAA nanoparticles dispersed well in membrane matrix, the hydrophilicity of the membranes prepared within TiO 2 - g -PAA nanoparticles have been improved and these membranes exhibited excellent water flux and antifouling performance in separation than that of the pure PASS membranes and PASS membranes with TiO 2 nanoparticles. More specifically, among membrane sample M0, M1.5, and MP1.5, MP1.5 which contained 1.5 wt% TiO 2 - g -PAA exhibited the highest water permeation (190.4 L/m 2 h at 100 kPa), flux recovery ratio, and the lowest BSA adsorption amount. POLYM. ENG. SCI., 55:2829–2837, 2015. © 2015 Society of Plastics Engineers
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POLYMER ENGINEERING AND SCIENCE
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2014
·Vol. 55
·期 3
·604-613
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IF 1.441
Yuhong Liu,Xiying Zhang,Ning Gao
In the study, isocyanate-functionalized hyperbranched polyurethane (HPU NCO ) with a degree of branch of 35.2% was synthesized via an A 2 + B 3 method. This novel HPU NCO was used to fabricate a blend system with hydroxyl groups bearing benzoxazine precursor (BZ OH ) to investigate its effective on the thermal properties of BZ OH . The structure of HPU NCO is confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance spectroscopy. The curing behavior of the reactive HPU NCO /BZ OH blend is investigated via differential scanning calorimetry and FTIR analyses. HPU NCO /BZ OH blend indicates two successively broad exotherm peaks centered at 132 and 204°C, respectively, which is obviously different from that of BZ OH with one broad peak centered at 206°C. Thermogravimetric analysis results confirmed that the thermal stability was enhanced and the char yield of BZ OH was increased from 34.3 to 43.2% by cocuring with 10 wt% HPU NCO . POLYM. ENG. SCI., 55:604–613, 2015. © 2014 Society of Plastics Engineers
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POLYMER ENGINEERING AND SCIENCE
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2013
·Vol. 54
·期 9
·1983-1989
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IF 1.243
Zhi-Wei Li,Bing Shao,Yong-Shan Huang,Xiao-Hong Li,Zhi-Jun Zhang
Macromolecule flame retardant melamine-dicyandiamide-formaldehyde-phosphoric acid (denoted as MDFP) was used as the shell material to synthesize zinc hydroxystannate@MDFP (denoted as ZHS@MDFP), a novel composite flame retardant with core–shell structure, via masterbatch method. The morphology and structure of ZHS@MDFP were analyzed by means of transmission electron microscopy, X-ray powder diffraction, Fourier transform infrared spectrometry, and thermal analysis. Moreover, the effect of ZHS@MDFP as a flame retardant on the flame-retardant behavior and mechanical properties of flexible poly(vinyl chloride) (denoted as PVC) was investigated. It has been found that as-synthesized ZHS@MDFP composite flame retardant has core–shell structure. Besides, as-synthesized ZHS@MDFP as a core–shell flame retardant is superior to ZHS in increasing the limiting oxygen index and decreasing the smoke density rating of PVC, which is because the decomposition of MDFP shell as the blowing agent expands the char layer thereby improving the flame-retarding capability of ZHS core. More importantly, ZHS@MDFP does not cause damage to the tensile strength and elongation at break of PVC matrix, which implies that the MDFP shell favors to improve the compatibility between ZHS and flexible PVC matrix. POLYM. ENG. SCI., 54:1983–1989, 2014. © 2013 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2013
·Vol. 54
·期 9
·2013-2022
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IF 1.243
Dongsheng Li,Zhimin Li,Fei Hu,Shengru Long,Gang Zhang,Jie Yang
A series of sulfonated poly(aryl ether sulfone) copolymers containing phenyl pendant groups with sulfonic acid groups on the backbone were synthesized through condensation polymerization. The degree of sulfonation (DS) of the copolymers was controlled by changing the feed ratios of sulfonated to unsulfonated monomers. Post-crosslink reactions are carried out with 4,4′-thiodibenzoic acid (TDA) as a crosslinker and the carboxylic acid groups in TDA can undergo Friedel–Craft acylation with the phenyls pendent rings in sulfonated poly(arylene ether sulfone)s copolymers to prepare polymer electrolyte membranes for fuel cell applications. The chemical structures of crosslinked and uncrosslinked sulfonated poly(arylene ether sulfone)s copolymers (SPSFs and CSPSFs) were characterized by FTIR, 1 H NMR spectra. The thermal and mechanical properties of the membranes were characterized by thermogravimetric analysis and stress–strain test. The dependence of water uptake, methanol permeability, proton conductivity, and selectivity on DS was studied. Transmission electron microscopic observations revealed that SPSFs and CSPSFs membranes form well-defined microphase separated structures. POLYM. ENG. SCI., 54:2013–2022, 2014. © 2013 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2013
·Vol. 54
·期 4
·925-931
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IF 1.243
Li-Ping Wang,Xin-Hu Lv,Guang Li,Yu-Chao Li
Amphiphilic diblock copolymer on silicon substrates were synthesized via surface-initiated reverse iodine transfer polymerization (RITP) technique. The silicon substrates (Si (111) surface) were modified with the azo groups, which were introduced by the treatment of Si (111) surface with 4,4′-azobis (4-cyanopentanoic acid). The poly(methyl methacrylate) (PMMA) were then prepared under RITP conditions from the Si (111) wafer. The synthesis of amphiphilic diblock copolymer was carried out on Si- g -PMMA substrate by sequential addition of monomer N -isopropylacrylamide (NIPAM). The observed narrow molecular weight distributions ( M w / M n ), linear kinetic plots, and linear plots of molecular weight ( M n ) versus monomer conversion indicate that the chain growth from the silicon substrates is a controlled process with a “living” characteristic. The ellipsometry and contact angle results indicated that the MMA had grafted from the surface of the silicon substrates successfully and the graft layer was well defined. The structure of the polymer and the ability to extend the chains were characterized and confirmed with the surface sensitive techniques such as X-ray photoelectron spectroscopy and atomic force microscope. POLYM. ENG. SCI., 54:925–931, 2014. © 2013 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2013
·Vol. 54
·期 4
·766-776
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IF 1.243
Long Li,Yi Qian,Chuanmei Jiao
Mg–Al–Fe ternary layered double hydroxides (LDH) were synthesized based on bayer red mud by calcination-rehydration method, and characterized using X-ray diffraction and thermogravimetric analysis (TGA). The synergistic flame retardant effects of ammonium polyphosphate (APP) with LDH in ethylene-vinyl acetate (EVA) composites were studied using limiting oxygen index (LOI), UL 94 test, cone calorimeter test (CCT), and smoke density test (SDT). The thermal degradation behavior of EVA/LDH/APP composites was examined by thermal gravimetric analysis-fourier transform infrared spectrometry (TG-FTIR). The results showed that LOI values decreased by incorporation of APP together with LDH; and, a suitable amount of APP in EVA/LDH composites can apparently improve UL 94 rating. The CCT results indicated that heat release rate (HRR) of the EVA/LDH/APP composites with APP decreased in comparison with that of the EVA/LDH composites. The SDT results showed that APP was helpful to suppress smoke. The TG-FTIR data showed that the composites with APP had a higher thermal stability than the EVA/LDH composites at high temperature. POLYM. ENG. SCI., 54:766–776, 2014. © 2013 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2014
·Vol. 55
·期 4
·889-895
·
IF 1.441
Liu Zhang,Haicun Yang,Hui Liu,Qingting Ni,Fanghong Gong
Polystyrene-grafted attapulgite (ATP-g-PS) was prepared using surface-initiated redox initiation via graft from approach. ATP was modified with (3- aminopropyl) triethoxysilane (APTES) to anchor amine on the surface (ATP-NH 2 ), and then ATP-NH 2 was further treated with 4-(diethylamino) salicylaldehyde (DEAS) to give aromatic tertiary amine groups functional ATP (ATP-ATA). Subsequently, the surface-initiated redox polymerization of styrene in the presence of ATP-ATA and benzoyl peroxide (BPO) was performed to afford ATP-g-PS . The chemical grafting of PS on the surface of ATP was confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis . The crystal structure of PS-grafted ATP was characterized by X-ray diffraction (XRD) analysis. The morphology of ATP-g-PS was observed by scanning electron microscopy (SEM) . POLYM. ENG. SCI., 55:889–895, 2015. © 2014 Society of Plastics Engineers
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POLYMER ENGINEERING AND SCIENCE
·
2016
·Vol. 56
·期 6
·643-649
·
IF 1.719
Changlin Cao,Lichao Liu,Qiangpin Li,Pingqin Chen,Qingrong Qian,Qinghua Chen
Wasted polytetrafluoroethylene fibers were recycled using high-energy ball milling technique, and the recylced polytetrafluoroethylene (r-PTFE) was employed to prepare nitrile rubber (NBR)/r-PTFE composites. The structure of r-PTFE and properties of NBR/r-PTFE composites were investigated by polarized optical microscope, laser particle size analyzer, differential scanning calorimetry, and scanning electron microscopy, respectively. The results show that increasing the milling time from 4 to 7 h leads to decreasing the average particle size, the degree of crystallinity and the number-average molecular weight of r-PTFE, whereas no obvious change is found by further prolonging the milling time. It is also clear that the NBR/r-PTFE composite with the r-PTFE obtained from a longer milling time possesses a higher mechanical and solvent resistance property. Compared with pure NBR, NBR/r-PTFE composites with r-PTFE for 7 h milling show a 21.9% increase in modulus at 300% and 27.8% decrease in swelling index. POLYM. ENG. SCI., 56:643–649, 2016. © 2016 Society of Plastics Engineers
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