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Issue 31, 2017
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Core–shell nano-latex blending method to prepare multi-shape memory polymers

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Abstract

Multi-shape memory polymers were prepared by blending a series of styrene (St)-block-(styrene-random-meth acrylate (MA))-block-styrene triblock copolymer nano-latexes. These latexes synthesized using a reversible addition-fragmentation chain transfer (RAFT) emulsion polymerization method have a core–shell structure. The cores are formed by the middle poly(St-random-MA) blocks. They act as transition phases with variable transition temperatures via adjusting the St/MA ratio. When the latexes are blended with an identical PSt shell but different poly(St-random-MA) cores, the shells play a role in preventing the aggregation of these poly(St-random-MA) cores forming a crosslinked network after hot-press treatment. Therefore a polymer with well-distributed multiple nanophases is achieved, which shows a quadruple-shape memory behavior. Furthermore, the shape memory and recovery performance at a certain temperature can be improved on purpose by increasing the mass ratio of the corresponding transition phases, which can be realized via simply varying the blending ratio of different latexes. An optimized multi-shape memory polymer with the shape memory and recovery ratio higher than 80% at all the transition temperatures is achieved.

Graphical abstract: Core–shell nano-latex blending method to prepare multi-shape memory polymers

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Publication details

The article was received on 05 May 2017, accepted on 22 Jun 2017 and first published on 11 Jul 2017


Article type: Paper
DOI: 10.1039/C7SM00899F
Citation: Soft Matter, 2017,13, 5324-5331
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    Core–shell nano-latex blending method to prepare multi-shape memory polymers

    H. Li, Y. Luo and X. Gao, Soft Matter, 2017, 13, 5324
    DOI: 10.1039/C7SM00899F

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