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標題: Side chain dendritic polyurethanes with shape-memory effect
作者: Tsai, C.C.
Chang, C.C.
Yu, C.S.
Dai, S.A.
Wu, T.M.
Su, W.C.
Chen, C.N.
Chen, F.M.C.
Jeng, R.J.
關鍵字: polymer networks;block-copolymers;polyurea/malonamide dendrons;mechanical-properties;glycol) complexes;nanocomposites;diisocyanate;elastomers;behavior
Project: Journal of Materials Chemistry
期刊/報告no:: Journal of Materials Chemistry, Volume 19, Issue 44, Page(s) 8484-8494.
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.
ISSN: 0959-9428
DOI: 10.1039/b910614f
Appears in Collections:材料科學與工程學系

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