摘要
本文以粘度法研究在苯溶剂中,ε-己内酯负离子开环聚合过程,增长链活性种烷氧基锂(—O^-Li^+)的缔合,发现己内酯活性种的缔合和一般非极性单体不同,前者在聚合过程中(单体消耗完以前)并不发生缔合。在单体消耗完以后,聚己内酯活性种才确实以缔合体的形式存在。这是由于内酯本身贡献了强的溶剂化作用。
The association of living species in the anionic polymerization of e-caprolatone initiated by t-BuOLi in benzene solvent was studied by viscometry. It has been found that after complete conversion of e-caprolatone monomer, association of alkoxyl-lithium is indeed present and the association tendency increases with increasing initiator concentration. However, before monomer was consumed (i.e. during the course of propagation), no intermolecular association between growing species was observed. The result is in good agreement with our kinetic study showing that the monomer lactone itself acts as a strong solvation agent.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1990年第5期538-541,共4页
Acta Polymerica Sinica
基金
国家自然科学基金
关键词
乙内酯
负离子聚合
烷氧基锂
Anionic polymerization, Association of living species, e-caprolatone, Al-koxyl-Lithium initiator, Ring-Opening polymerization
