activation by an external stimulus. This was ascribed to enhanced stabilization of the released radical compared to other secondary alkyl radicals. The AzSG1 alkoxyamine was successfully used for the NMP for styrene, n-butyl acrylate, and methyl methacrylate with the addition of a small amount of acrylonitrile as a comonomer, without the need for free SG1. In all cases, first-order kinetics, good control
报道了通过氮氧化物介导的聚合反应(
NMP)一步合成氮杂内酯官能化的基于SG1的烷氧基胺(AzSG1)的功能聚合物的设计。在347.7 K时,其解离速率常数k d被确定为2.72×10 –4 s –1,从而导致活化能E a为119.5 kJ mol –1,这是有史以来针对a的最低值。基于SG1的仲烷氧基胺,无需外部刺激即可激活。与其他仲烷基相比,这归因于释放的自由基的增强的稳定性。AzSG1烷氧基胺已成功用于
苯乙烯的
NMP,n-
丙烯酸丁酯和
甲基丙烯酸甲酯,并添加少量的
丙烯腈作为共聚单体,而无需游离的SG1。在所有情况下,都获得了一级动力学,良好的控制和低分散度(Đ = 1.2-1.4)以及高活性链分数(LF〜90%)。作为概念证明,已成功证明了将内酯内酯官能化的聚合物与
苄胺和溶菌酶结合。这项工作可能会引起共轭,因为已知lac内酯官能团会与其他亲核试剂(例如醇或
硫醇)反应。