Demonstration of isospecific free radical polymerization of acrylate controlled by conformation and chirality of monomer
作者:Hitoshi Tanaka、Yoshitaka Matsubara、Katsuhiko Kusunoki、Naoki Saito、Tatsuya Kibayashi
DOI:10.1002/pola.27649
日期:2015.9.1
Radical polymerization of lactic acid‐based chiral and achiral methylene dioxolanones, a model for conformationally s‐cis locked acrylate, was carried out with AIBN to demonstrate an isospecific free radical polymerization controlled by chirality and conformation of monomer. Polymerization of the dioxolanones proceeded smoothly without ring opening to give a polymer with moderate molecular weight and
用AIBN进行了基于乳酸的手性和非手性亚甲基二恶唑酮的自由基聚合,这是一种构象为顺式锁定丙烯酸酯的模型,以证明受手性和单体构象控制的同种自由基聚合。二氧戊环酮的聚合反应顺利进行而没有开环,得到分子量适中且最大全同立构规整度为100%的聚合物。ESR谱表明在对比基团生长的聚(亚甲基dioxolanone)的扭曲构象这样的无环基团类似的,这表明围绕主链中的自由旋转的限制ç α Ç β激进的激进中心的纽带。手性以及单体的极性和膨松度影响聚合物的立构规整度,并且手性烷基取代基将提供高全同立构的聚合物,其中单体的对映异构体过量越高,则聚合物的全同立构规整度越高。同时,包括二苄基和三氯甲基的非手性或极性取代基将提供无规立构的聚合物。另外,所得聚合物的玻璃化转变温度(T g)非常高,为172.2至229.8℃,甚至对于全同立构聚合物,T g也高达206.8℃。©2015 Wiley Periodicals,Inc