摘要
以N,N,N,′N′-四甲基乙二胺-过硫酸钾为氧化-还原引发体系,用水相沉淀聚合法合成了超高相对分子质量的聚醋酸乙烯(PVAc)。研究了引发剂浓度、反应温度、单体与水用量比、转化率等对聚合反应的影响。其结构用IR表征,相对分子质量及其分布和支化度用GPC测定。结果表明,醋酸乙烯最终转化率为90%~95%,PVAc的平均聚合度为8 000~15 000,相对分子质量分布指数为2.12~2.24,支化度为2.10~2.80。
Using N, N, N＇, N＇-tetramethylethylenediamine and potassium persulphate as a redox initiation system, high molecular weight poly（ vinyl acetate） （PVAc） was synthesized by aqueous deposi^d polymerization. The effects of concentration of initiator, polymerization temperature, the ratio of VAc to water and conversion of VAc to PVAc on polymerization were discussed. The structure of PVAc was characterized by IR and the relative molecular weight and relative molecular weight distribution were determinated by GPC. The results showed that ultimate conversion of VAc to PVAc was 90% - 95%, the average degree of polymerization of PVAc was 8 000 - 15 000, the relative molecular weight distribution index of PVAc was 2.12 - 2.24, and the degree of branching of PVAc was 2.10 - 2.80.
出处
《合成化学》
CAS
CSCD
2006年第5期516-519,共4页
Chinese Journal of Synthetic Chemistry
关键词
氧化-还原引发体系
水相沉淀聚合
聚醋酸乙烯
高相对分子质量
支化度
redox initiation system
aqueous deposited polymerization
poly（ vinyl acetate）
high relative molecular weight
degree of branching
