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Synthesis of polystyrene-styrene/butadiene diblock copolymers via reversible addition-fragmentation chain transfer miniemulsion polymerization

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Chinese Chemical Letters 2010年第12期21卷 1497-1500页

作者： Zhen Xi Wang Qing Hua Zhang Yi Tao Yu Xiao Li Zhan Feng Qiu Chen Ji Hai Xiong Department of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China Institute of Energy Conversion Jiangxi Academy of Sciences Nanchang 330029 China

Polystyrene-styrene/butadiene diblock copolymers were synthesized via reversible addition-fragmentation chain transfer （RAFT） miniemulsion polymerization.During the polymerization process,the molecular weight distribution was narrow and the numerical molecular weight of the copolymers increased with increasing conversion of monomers,which was close to the theoretical.FT-IR and ^1H NMR results indicated that the microstructure of the polymer was mainly 1,4-trans-butadiene with small amount of 1,2-units,and composition in the copolymers was obtained.

关键词： reversible addition-fragmentation chain transfer Polystyrene-styrene/butadiene diblock copolymers Miniemulsion polymerization

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Grafting of MIPs from PVDF Membranes via reversible addition-fragmentation chain transfer Polymerization for Selective Removal of p-Hydroxybenzoic Acid

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Chemical Research in Chinese Universities 2018年第6期34卷 1051-1057页

作者： DONG Yanying YU Ping SUN Qilong LU Yang TAN Zhenjiang YU Xiaopeng School of Computer Science Key Laboratory of Numerical Simulation of Jilin Province School of Management Jilin Normal University Siping 136000 P. R. China

Effective molecularly imprinted membranes（MIMs） were developed as an efficient adsorbent for the selective removal ofp-hydroxybenzoic acid（p-HB） from acetylsalicylic acid（ASA, aspirin）. The MIMs were grafted successfully from poly（vinylidene fluoride） microfiltration membranes via reversible addition-fragmentation chain transfer（RAFT） polymerization. The graft copolymerization of acrylic acid（AA） in the presence of template p-hydroxybenzoic acid led to molecularly imprinted polymer（MIP） film coated membranes. The obtained MIMs were characterized by scanning electron microscopy（SEM）, Fourier transform infrared spectrophotometer（FTIR） and Raman spectra, and batch mode adsorption studies were carried ont to investigate the specific adsorption equilibrium, kinetics and selective recognition properties of different MIMs. The kinetic properties of the MIMs could be well described by the pseudo-second-order rate equation. Selective permeation experiments were performed to evaluate the permeation selectivity of the p-HB imprinted membranes. The observed performances of the MIMs are applicable to the further purification of aspirin. Keywords Acetylsalicylic acid; reversible addition-fragmentation chain transfer; Molecularly imprinted membrane; p-Hydroxybenzoic acid; Selective adsorption

关键词： Acetylsalicylic acid reversible addition-fragmentation chain transfer Molecularly imprinted membrane p-Hydroxybenzoic acid Selective adsorption

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Effect of Phase Separation Size on the Properties of Self-healing Elastomer

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Chinese Journal of Polymer Science 2024年第6期42卷 798-804页

作者： Jun Xu Lei Zhu Xian-Qi Feng Cong Sui Wen-Peng Zhao Shou-Ke Yan School of Chemical Engineering Qingdao University of Science&TechnologyQingdao266042China College of Engineering Yanching institute of TechnologyLangfang065210China Key Laboratory of Rubber-plastics Qingdao University of Science&TechnologyQingdao266042China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

Regulation of phase structure has been recognized as one of the most effective ways to fabricate self-healing polymers with high mechanical strength.The mechanical properties of the resultant polymers are certainly affected by the size of separated phase domain.However,the study on this aspect is absence,because it can hardly exclude the influence of variation in monomer proportion required for tuning the separated phase size.Here,we report the first study on tuning the phase size through reversible addition-fragmentation chain transfer(RAFT)polymerization without changing the proportion of monomers.As expected,the size of separated phase has been successfully mediated from 15 nm to 9 nm by tuning the molecular weight of the chain transfer agent.It is found that the mechanical strength and the self-healing efficiency of the resultant polymers increase simultaneously with the decrease of phase size.The study on the formation kinetics of hydrogen bonds reveals that the decrease of phase size can facilitate the re-bonding rate of hydrogen bonds,even if the migration of polymer chains is restricted.

关键词： Self-healing polymers Phase separation reversible addition-fragmentation chain transfer

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Application of Nano-TiO2 Immobilized Polypropylene Membrane for Phenol Decomposition in a Photocatalytic Membrane Reactor

Application of Nano-TiO2 Immobilized Polypropylene Membrane ...

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2011年全国高分子学术论文报告会

作者： Song Yang,Xiu-Ming Wu,Liang Wang,Jin Zhou,Hai-Yin Yu 安徽师范大学化学与材料科学学院

The main technical barriers that impede photocatalytic membrane reactor (PMR) commercialization remain on the post-recovery of the catalyst particles after water treatment.

关键词： photocatalytic membrane reactor polypropylene microporous membrane reversible addition-fragmentation chain transfer titanium oxide nanoparticles water treatment.

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