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Issue 44, 2009
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Side chain dendritic polyurethanes with shape-memory effect

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In this study, thermally reversible polyurethanes (PUs) with shape memory effect were developed by using hydrogen bonding to enhance physical interactions. Two different types of PUs were synthesized: (1) a linear PU whose hard segment consists of methylene di-para-phenyl isocyanate (MDI) and di(ethylene glycol) (DEG); its soft segment is made of Tone 0260 polyol, a polyester polyol; (2) a side-chain dendritic PU which replaces DEG with different generations of dendritic chain extenders. By incorporation of the dendritic structure with peripheral long alkyl chains (strong van der Waals forces), the miscibility between hard and soft segments can be significantly improved. Consequently, the hydrogen bonding reinforced hard segments (malonamide linkages) of side chain dendritic PUs result in greatly enhanced mechanical properties and shape memory effect. During cyclic shape memory tests, one of the series can effortlessly achieve complete recovery in less than 10 second without any deficiency.

Graphical abstract: Side chain dendritic polyurethanes with shape-memory effect

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Article information

29 May 2009
11 Sep 2009
First published
02 Oct 2009

J. Mater. Chem., 2009,19, 8484-8494
Article type

Side chain dendritic polyurethanes with shape-memory effect

C. Tsai, C. Chang, C. Yu, S. A. Dai, T. Wu, W. Su, C. Chen, F. M. C. Chen and R. Jeng, J. Mater. Chem., 2009, 19, 8484
DOI: 10.1039/B910614F

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