摘要
乙酸乙烯酯(VAc)与丙烯酸(AA)在GeCl_4及BCl_3存在下通过自由基聚合可得到交替共聚物。对GeCl_4体系,聚合反应速率正比于[引发剂]^(0.5)。当VAc/AA=1:1(mol比)时有最大反应速率。CCl_4对本聚合反应无链转移作用。通过紫外光谱分析可证实VAc及AA均与GeC\(?)生成络合物;ESR分析表明,络合AA自由基较未络合AA有较强的阳离子特性,交替共聚的原因可能与络合AA自由基及活化单体络合物二者有关。
Alternating copolymers of vinyl aceta te ( VAc) and acrylic acid . ( AA ) were obtained by free radical polymerization in the presence of GeCl4 and BC13. The reaction rate was proportional to [initiator]0. 5 for GeCl4 system. The optimum rate was obtained when the molar ratio of VAc:AA= 1:1. The chain transfer agent CC14 had no chain transfer effect on the reaction. It was demonstrated that by ultraviolet spectrum analysis, either VAc or AA formed complexes with GeCl4. The ESR analysis showed that salt complexed AA radicals had greater cationic nature than uncomplexed AA radicals, and the alternating copolymerization might be due to both complexed AA radicals and activated monomer complexes.
出处
《合成橡胶工业》
CAS
CSCD
北大核心
1990年第4期253-258,共6页
China Synthetic Rubber Industry
基金
中国科学院基金委员会资助
关键词
乙酸乙烯酯
丙烯酸
共聚
LEWIS酸
free radical copolymerization
alternating copolymeriza- tion
vinyl acetate
acrylic acid
germanium tetrachloride
boron tri- chloride
