Synthesis of higher molecular weight PAN and its copolymers for carbon fibers

作     者：Wangxi Zhang Yanzhi Wang Jieying Liang Jie Liu 

作者机构：Department of Materials and Chemical Engineering Zhongyuan University of Technology Zhengzhou 450007 China Department of Carbon Fibers and Composites Beijing University of Chemical Technology Beijing 100029 China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2005年第12卷第4期

页      面：376-382页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：This work was financially supported by the National Natural Science Foundation of China (No. 50333070)the Natural Science Foundation of Henan Province  China (No.200510465008  0523021300) 

主　　题：polyacrylonitrile acrylonitrile polymerization polymer 

摘      要：Higher molecular weight polyacrylonitrile （PAN） was obtained by the free-radical suspension copolymerization of itaconic acid （IA） and acrylonitrile （AN） which was carded out in DMSO/H2O using 2,2＇-azodiisobutyronitrile （AIBN） as the initiator. The effects of polymerization parameters, such as IA monomer concentration and DMSO/H2O ratio, on the conversion of polymerization and number-average molecular weight are specially described. The copolymerization reaction rate and the number-average molecular weight of the resultant copolymers decrease with the result of high chain transfer constant of DMSO. For the copolymerization of AN and IA, with the inclusion of the good solvent DMSO, the solution degree of AN in DMSO/H2O is higher than that in water, as a result, the resulting copolymer pellets range from soft bulk to solid grain, as characterized by the use of SEM. Higher molecular weight P（AN-co-IA） copolymers have a lower initiation of exothermal reaction temperature and wider DSC exothermal peaks compared with PAN homopolymers, which corresponds with the results of an IR study.