ASIA unversity:Item 310904400/8350
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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/8350


    Title: Shape memory effects of poly(ethylene terephthalate-co-ethylene succinate) random copolymers
    Authors: Tsai, Y (Tsai, Yuhsin);Tai, CH (Tai, Chia-hon);Tsai, SJ (Tsai, Shih-Jung);Tsai, FJ (Tsai, Fuu-Jen)
    Contributors: Department of Biotechnology
    Keywords: copolyester;shape memory;poly(ethylene terephthalate);poly(ethylene succinate);STRAIN-INDUCED CRYSTALLIZATION;POLY(ETHYLENE-TEREPHTHALATE);POLYMERS;POLYNORBORNENE;POLYURETHANE;COPOLYESTERS;TEMPERATURE;BEHAVIOR;OXIDE)
    Date: 2008-02
    Issue Date: 2010-03-26 02:30:00 (UTC+0)
    Publisher: Asia University
    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 H-1 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. (c) 2007 Elsevier Ltd. All rights reserved.
    Relation: EUROPEAN POLYMER JOURNAL, 44 (2): 550-554
    Appears in Collections:[Department of Biotechnology] Journal Article

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