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Issue 1, 2015
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Doubly thermo-responsive nanoparticles constructed with two diblock copolymers prepared through the two macro-RAFT agents co-mediated dispersion RAFT polymerization

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Abstract

A new strategy to prepare doubly thermo-responsive nanoparticles constructed with the two diblock copolymers poly(N-isopropylacrylamide)-block-polystyrene (PNIPAM-b-PS) and poly[N,N-(dimethylamino) ethyl methacrylate]-block-polystyrene (PDMAEMA-b-PS) through the two macro-RAFT agents co-mediated dispersion polymerization is proposed. In this two macro-RAFT agents co-mediated dispersion polymerization, two macro-RAFT agents are simultaneously adopted, and the two in situ synthesized diblock copolymers PNIPAM-b-PS and PDMAEMA-b-PS co-assemble into nanoparticles containing a PNIPAM/PDMAEMA mixed corona and a common PS core. It is found that the molecular weight of PNIPAM-b-PS and PDMAEMA-b-PS in the mixed corona–core nanoparticles increases with the monomer conversion, and the size of the mixed corona–core nanoparticles increases with the PS block extension during the two macro-RAFT agents co-mediated dispersion polymerization. In water, the mixed corona–core nanoparticles exhibit two separate phase transition temperatures of 44 °C and 56 °C, corresponding to the PNIPAM and PDMAEMA blocks, respectively, which is confirmed by turbidity analysis, 1H NMR analysis and TEM observation. Our strategy named the two macro-RAFT agents co-mediated dispersion polymerization is believed to be a valid method to prepare multi-thermo-responsive nano-objects constructed with two or more than two thermo-responsive diblock copolymers.

Graphical abstract: Doubly thermo-responsive nanoparticles constructed with two diblock copolymers prepared through the two macro-RAFT agents co-mediated dispersion RAFT polymerization

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Publication details

The article was received on 22 Jul 2014, accepted on 04 Sep 2014 and first published on 04 Sep 2014


Article type: Paper
DOI: 10.1039/C4PY00998C
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Citation: Polym. Chem., 2015,6, 70-78

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    Doubly thermo-responsive nanoparticles constructed with two diblock copolymers prepared through the two macro-RAFT agents co-mediated dispersion RAFT polymerization

    Q. Li, X. He, Y. Cui, P. Shi, S. Li and W. Zhang, Polym. Chem., 2015, 6, 70
    DOI: 10.1039/C4PY00998C

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