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Issue 14, 2016
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Janus long-chain hyperbranched copolymers of PSt and POEGMA from a self-assembly mediated click reaction

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Abstract

A self-assembly mediated synthesis was successfully adopted in the preparation of Janus long-chain hyperbranched copolymers composed of polystyrene (PSt) and poly[oligo(ethylene glycol) methacrylate] (POEGMA) half-dendrons. Firstly, seesaw macromonomers with one alkynyl group at the chain center and one azido group at each chain end, [alkynyl-(PSt-N3)2 and alkynyl-(POEGMA-N3)2], were prepared through atom transfer radical polymerization and used to produce their own long-chain hyperbranched homopolymers (lhb-PSt and lhb-POEGMA) through a click reaction, followed by the conversion of azido end-groups into amino end-groups. Meanwhile, one hetero four-arm copolymer of μ-PSt2-POEGMA2 with four azido end-groups was obtained by the sequential click reaction of alkynyl-(PSt-Br)2 and alkynyl-(POEGMA-Br)2 with α,ω-diazido tetra(ethylene glycol) and the conversion of bromo groups into azido groups. Finally, with the help of self-assembly in different selective solvents, lhb-POEGMA and lhb-PSt were linked alternately onto μ-PSt2-POEGMA2 through click chemistry, resulting in a Janus long-chain hyperbranched copolymer [μ-(lhb-POEGMA)(lhb-PSt)]. The different analytical techniques confirmed the successful preparation of μ-(lhb-POEGMA)(lhb-PSt) and its different precursors. The self-assembly behavior of different amphiphilic copolymers was investigated by TEM, DLS and DSC. The variation of the contact angle of μ-(lhb-POEGMA)(lhb-PSt) with the casting solvent was correlated with its self-assembly behavior in selective solvents.

Graphical abstract: Janus long-chain hyperbranched copolymers of PSt and POEGMA from a self-assembly mediated click reaction

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Publication details

The article was received on 12 Jan 2016, accepted on 05 Feb 2016 and first published on 08 Feb 2016


Article type: Paper
DOI: 10.1039/C6PY00060F
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Citation: Polym. Chem., 2016,7, 2476-2485

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    Janus long-chain hyperbranched copolymers of PSt and POEGMA from a self-assembly mediated click reaction

    S. Chen, C. He, H. Li, P. Li and W. He, Polym. Chem., 2016, 7, 2476
    DOI: 10.1039/C6PY00060F

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