聚醋酸乙烯酯的光引发可控合成——介绍一个高分子化学综合实验

Synthesis of Poly(vinyl acetate)with Controlled Structure by Photo-Induced Polymerization

本实验开展了醋酸乙烯酯的可逆加成-断裂链转移自由基聚合(RAFT),分别运用偶氮二异丁腈(AIBN)引发和可见光引发两种方式进行了聚合反应,运用核磁共振和凝胶色谱等多种手段对所得聚合物结构进行了表征与分析。通过比较AIBN引发与光引发所获得聚合物端基结构的异同,加深了学生对RAFT聚合方法原理的理解。同时,运用该方法实现了聚合物两端端基结构的高度功能化,深入体会聚合物合成设计概念。本综合实验教学不仅通过对比法加深了学生对实验原理和专业知识的理解,提升了学生创新研究能力,而且训练了学生的实验操作技能、大型仪器使用能力和结果分析能力,提升了综合素质。

This experiment introduced newly developed photo-induced living/controlled radical polymerization technique,particularly reversible addition-fragmentation chain transfer polymerization(RAFT),which was known as the frontier knowledge in polymer chemistry.Students will find the advantages of photo-induced RAFT polymerization in preparing high-end functionalized polymer through the comparison of photo-induced RAFT polymerization with AIBN initiated RAFT polymerization.The experimental work includes synthesis of regulator,polymerization,separation of polymer,and structure characterization.Students could learn and master skills of design and synthesis of regulator for photo-induced living radical polymerization.They can practice basic laboratory skills,such as organic synthesis and polymerization.Also,they can learn typical characterization techniques of the polymer,which includes gel permeation chromatograph(GPC)and nuclear magnetic resonance(NMR).The aim of this experiment was to enhance the students with creative thinking and to train their fundamental ability for research.