摘要
在已有基团转移聚合机理研究的基础上,提出特种离子场活化聚合机理。认为在基因转移聚合过程中,阴离子催化剂主要是形成一种特殊形式的“离子场”,从而使引发剂得到活化。这种场的总强度Q与催化剂摩尔浓度成正比;而每个引发剂分子分享到的场强Q_i则与其本身摩尔浓度n成反比,即Q_i=Q/n;当Q_i达到一特定值,即Q_i>Q_(min),基因转移聚合便可发生。在特定范围内,Q_i值越大,引发剂受到活化的程度越高,聚合诱导期越短,聚合反应也越快。
On the basis of former studies, a mechanism of group transfer polymerization ac-tivated by ionic field was proposed. In this mechanism, initiator is activated by asepecial ionic field produced by anionic catalyst. Total intensity of the field, Q, isdirectly proportional to the equivalent concentratlon of catalyst and the intensity of thefield enjoyed by each molecule of initiator, Qi, is inversely proportional to the equiva-lent eoncentration of initiator (n), i.e,Q_i=Q/n. Along as Q_i reach a certain value, i.e.Q_i>Q_(min) group transfer polymerization will take place Alongside the raise ofQi_ value, activation extent of initiator raises, induction preiod of polymerization short-ens, and the speed of polymerization increases.
出处
《功能高分子学报》
CAS
CSCD
1992年第2期158-168,共11页
Journal of Functional Polymers
关键词
基团转移聚合
离子场
活化聚合
group transfer polymerization
polymerization mechanism
ionic filed
activation
