Insight in Solvent and Chain Transfer Effects on Copolymerization Behavior and Branched Structure of Ethylene-Vinyl Acetate Copolymer

被引：0
|
作者：
Xiao C. [1 ]
Li Y. [1 ]
Fan J. [1 ]
Li Y. [1 ]
机构：
[1] R& D Center, Sinopec Chongqing SVW Chemical Co., LTD, Chongqing
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2022年 / 38卷 / 01期
关键词：
Acetylation; Alcoholysis; Branch; Ethylene-vinyl acetate;
D O I：
10.16865/j.cnki.1000-7555.2022.0007
中图分类号：
学科分类号：
摘要：
Ethylene- vinyl acetate copolymers (EVM) with high content of vinyl acetate and high molecular weight were prepared by solution copolymerization. A method of regulating the branched structures and molecular weight of the copolymers based on chain transfer effects was established by the study of solvent effects on the copolymerization behavior and branching evolution. The results show that tert-butyl alcohol with the lowest chain transfer constant is beneficial to increase molecular weight of EVM, under the condition of high conversion of vinyl acetate (VAc). The branching evolution of EVM in tert-butanol with polymerization time is further studied, which reveals that the acetoxyl groups in the vinyl acetate unit are the main branching sites. This study can provide the theoretical basis and practical reference for regulating the molecular structure of EVM and realizing the industrial production of high-performance EVM. © 2022, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：36 / 42
页数：6
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