Shape memory effects of poly(ethylene terephthalate- co-ethylene succinate) random copolymers.

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Title:	Shape memory effects of poly(ethylene terephthalate- co-ethylene succinate) random copolymers.
Authors:	蔡育勳;(Chia-hon Tai);(Shih-Jung Tsai);蔡輔仁(Fuu-Jen Tsai)
Contributors:	中醫學院中國醫學研究所 Copolyester;Shape memory;Poly(ethyleneterephthalate);Poly(ethylene succinate)
Date:	2008-02
Issue Date:	2009-08-19 16:36:03 (UTC+8)
Abstract:	Random copolymers based on terephthalate acid, succinic acid and ethylene glycol, with thermally induced shape memory, were synthesized via melt polycondensation. The chemical structures of these poly(ethylene terephthalate-co-ethylene succinate) copolymers (PET-co-ES) were ascertained by 1HNMRspectroscopy. The thermal and viscoelastic characteristics of these copolymers were studied in terms of the succinic acid content using differential scanning calorimetry and dynamic mechanical analysis. The shape memory effects of the copolymers were examined using the strain test. The experimental results suggested that all copolymers exhibited shape memory above the glass transition temperature and that the highest shape recovery rate was 90%. The shape recovery rates of all test samples declined with the number of cycles. This decrease in the shape recovery ratemayresult fromthe change in the degree of polymer orientation and/or crystallinity during repeated testing.
Relation:	EUROPEAN POLYMER JOURNAL44(2):550~554
Appears in Collections:	[Graduate Institute of Chinese Medical Science] Journal articles

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