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Shape memory effects of poly(ethylene terephthalate-co-ethylene succinate) random copolymers |
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| Authors: | Yuhsin Tsai Chia-hon Tai Fuu-Jen Tsai |
| Institution: | a Nano-Powder and Thin Film Technology Center, Industrial Technology Research Institute, Tainan, Taiwan b Graduate Institute of Chinese Medical Science, China Medical University, Taichung, Taiwan c Department of Medical Genetics, Pediatrics and Medical Research, China Medical University Hospital, Taichung, Taiwan d Department of Biotechnology and Bioinformatics, Asia University, Taichung, Taiwan |
| 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 1H 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. |
| Keywords: | Copolyester Shape memory Poly(ethylene terephthalate) Poly(ethylene succinate) |
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