Shape memory effects of poly(ethylene terephthalate-co-ethylene succinate) random copolymers
| Autor: | Shih Jung Tsai, Chia hon Tai, Yuhsin Tsai, Fuu Jen Tsai |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
chemistry.chemical_classification
Materials science Ethylene Polymers and Plastics Organic Chemistry General Physics and Astronomy Polymer Dynamic mechanical analysis chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering Succinic acid Poly(ethylene succinate) Polymer chemistry Materials Chemistry Glass transition Ethylene glycol |
| Zdroj: | European Polymer Journal. 44:550-554 |
| ISSN: | 0014-3057 |
| DOI: | 10.1016/j.eurpolymj.2007.11.019 |
| Popis: | 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 1 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. |
| Databáze: | OpenAIRE |
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