Premium
Studies of Free Radical Polymerization Initiated by Visible Light Photoredox Catalysis
Author(s) -
Chen Yiyong,
Hu Zhongnan,
Xu Dawen,
Yu Yingfeng,
Tang Xiaolin,
Guo Hao
Publication year - 2015
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201500006
Subject(s) - polymerization , molar mass , radical polymerization , photochemistry , radical , chemistry , polymer chemistry , cobalt mediated radical polymerization , living free radical polymerization , photopolymer , chain transfer , reversible addition−fragmentation chain transfer polymerization , polymer , organic chemistry
A visible‐light‐induced free radical polymerization has been developed. Distinct from living radical polymerizations, this polymerization process is not controlled in the chain growth step but the initiation step, by in situ generation of a constantly low concentration of initiator radicals. “On”–“off” experiments demonstrate the ease of controllability of the process, which indicate that it may be an improved method for radical polymerization, since it can be initiated immediately by powering on a light, without any process of preheating the reaction mixture, and can also be sharply stopped by turning off the light, without any cooling process. By adjusting the photo irradiation strength, reaction temperature, and the amount of the initiator system, the molar mass as well as conversion rate can be accurately tuned, which is not easy to realize in other free radical polymerization systems. Notably, a molar mass as high as 5.64 × 10 5 g mol −1 ( Đ = 1.71) is achieved with this new methodology.