Citation: Yi-Feng Zhu, Feng-Jiao Jiang, Pan-Pan Zhang, Jiao Luo, Hua-Dong Tang. Atom transfer radical polymerization and copolymerization of isoprene catalyzed by copper bromide/2,2'-bipyridine[J]. Chinese Chemical Letters, ;2016, 27(6): 910-914. doi: 10.1016/j.cclet.2016.02.029 shu

Atom transfer radical polymerization and copolymerization of isoprene catalyzed by copper bromide/2,2'-bipyridine

Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China

Received Date: 19 November 2015
Revised Date: 4 February 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21174133) and Zhejiang Science Foundation for Distinguished Young Scholars (No. LR12B04002).

ATRP, as one of the most successful controlled/"living" radical polymerization techniques, has been applied to a large variety of monomers including styrenes, (meth)acrylates, (meth)acrylamides, acrylonitrile, and vinyl acetate. However, ATRP of isoprene still remains a challenge due to poor solubility of copper catalysts in isoprene and low chain propagation rate constant of the monomer. In this work, CuBr/2,2'-bipyridine was found to effectively mediate ATRP of isoprene at 100 ℃, 130 ℃, and 150 ℃ with ethyl 2-bromopropionate as an initiator. The polymerizations proceeded smoothly and reached 48.1%, 53.3%, and 71.0% conversions, respectively, in 72 h, producing polyisoprenes with molecular weights close to theoretical values and relatively narrow distributions. A block copolymer of polystyrene-bpolyisoprene was prepared using CuBr/2,2''-bipyridine as a catalyst and polystyrene as amacroinitiator. The 1H NMR and 13C NMR analysis of polyisoprene indicated that the polymer had 88.8% 1,4-addition structure and 63.9% of the polymer backbone units were in trans-configuration.
- Atom transfer radical polymerization,
- Isoprene,
- Kinetics,
- Block copolymer
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