Synthesis of block copolymers viathe combination of RAFT and a macromolecular azo coupling reaction

We report a novel modular strategy for the synthesis of block copolymers viathe combination of a macromolecular azo coupling reaction and a reversible addition fragmentation chain transfer (RAFT) polymerization method. One block, with a terminus suitable for an azo coupling reaction, was obtained by...

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Published inPolymer chemistry Vol. 4; no. 2; pp. 402 - 406
Main Authors He, Yaning, He, Wei, Liu, Dan, Gu, Tonghan, Wei, Renbo, Wang, Xiaogong
Format Journal Article
LanguageEnglish
Published 01.12.2012
Subjects
Azo
Block copolymers
Blocking
Chain transfer
Joining
Polymerization
Rafts
Synthesis
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Summary:We report a novel modular strategy for the synthesis of block copolymers viathe combination of a macromolecular azo coupling reaction and a reversible addition fragmentation chain transfer (RAFT) polymerization method. One block, with a terminus suitable for an azo coupling reaction, was obtained by RAFT polymerization using a synthesized chain transfer agent (CTA) with the designed functional group. The other block, with a diazonium salt terminus, was obtained by the diazotization of aniline-functionalized PEG, which was prepared by a nucleophilic substitution reaction between the synthesized tosylate ended mPEG and p-aminobenzoic acid. The macromolecular azo coupling reaction between the above two polymer blocks was carried out in a polar organic solvent such as DMF under extremely mild conditions. Block copolymers with well-defined structures can be efficiently prepared through this approach.
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ISSN:1759-9954
1759-9962
DOI:10.1039/c2py20653f