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Switchable Reversible Addition–Fragmentation Chain Transfer (RAFT) Polymerization with the Assistance of Azobenzenes
Author(s) -
Nie Huijun,
Li Shenzhen,
Qian Sijia,
Han Zhongqiang,
Zhang Wangqing
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201904991
Subject(s) - chain transfer , reversible addition−fragmentation chain transfer polymerization , raft , polymerization , radical polymerization , chemistry , living free radical polymerization , photochemistry , polymer chemistry , chain growth polymerization , living polymerization , ionic polymerization , bulk polymerization , polymer , organic chemistry
Modulating controlled radical polymerization is an interesting and important issue. Herein, modulating RAFT polymerization employing photosensitive azobenzenes is achieved. In the presence of azobenzenes and with visible light off, RAFT polymerization runs smoothly and follows a pseudo‐first‐order kinetics. In contrast, with light on, RAFT polymerization is greatly decelerated or quenched depending on the type and concentration of azobenzenes. Switchable RAFT polymerization of different (meth)acrylate monomers alternatively with light off and on is demonstrated. A mechanism of photoregulating RAFT polymerization involving radical quenching by azobenzenes is proposed.