ASIA unversity:Item 310904400/8638
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    题名: Shape memory effects of poly(ethylene terephthalate-co-ethylene succinate) random copolymers
    作者: Tsai, Yuhsin;Tai, Chia-hon;Tsai, Shih-Jung;Tsai, Fuu-Jen
    贡献者: Department of Biotechnology
    关键词: Ethylene glycol;Organic acids;Polycondensation;Polyethylene terephthalates;Shape memory effect;Structure (composition);Synthesis (chemical) -Polyethylene succinates;Shape recovery rates
    日期: 2008
    上传时间: 2010-04-07 13:18:01 (UTC+0)
    出版者: Asia University
    摘要: 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 <sup>1</sup>H NMR spectroscopy. 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 rate may result from the change in the degree of polymer orientation and/or crystallinity during repeated testing. © 2007 Elsevier Ltd. All rights reserved.
    關聯: European Polymer Journal 44:550-554
    显示于类别:[生物科技學系] 期刊論文

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