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| 热致形状记忆环氧乙烷—对苯二甲酸乙二酯多嵌段共聚物 | |
| 引用本文： | 罗筱烈 徐懋. 热致形状记忆环氧乙烷—对苯二甲酸乙二酯多嵌段共聚物[J]. 中国科学技术大学学报, 1997, 27(1): 103-108 |
| 作者姓名： | 罗筱烈 徐懋 |
| 作者单位： | 中国科学院北京化学所 |
| 基金项目： | 国家自然科学基金,国家科委基础性研究重大关键项目 |
| 摘 要： | 不同软链段长度和不同硬链段含量的环氧乙烷－对苯二甲酸乙二酯被合成．分别测试了它们的拉伸样条的热致形变恢复．Ｓ形热致形变恢复曲线用最大形变恢复率（Ｒｆ），形变恢复温度（Ｔｒ）和形变恢复速度（Ｖｒ）表征．这些量的数值结果表明软链段的结晶状况决定热致形变恢复温度，最大形变恢复和形变恢复速度既依赖于硬链段所形成的物理交联点的稳定性，也受软链段长度变化的影响．后一影响是形变恢复的熵本质决定的 |
| 关 键 词： | 多嵌段共聚物，形状记忆，长软链段 |
Thermally Stimulated Recovery of Ethylene Oxide-Ethylene Terephthalate Segmented Copolymmers |
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| Luo Xiaolie Zhang Xiaoyun Wang Mingtai Ma Dezhu. Thermally Stimulated Recovery of Ethylene Oxide-Ethylene Terephthalate Segmented Copolymmers[J]. Journal of University of Science and Technology of China, 1997, 27(1): 103-108 | |
| Authors: | Luo Xiaolie Zhang Xiaoyun Wang Mingtai Ma Dezhu |
| Abstract: | A series of ethylene oxide-ethylene terephthalate segmented copolymers with different soft segment length and different hard segment content have been synthesized. The thermally stimulated recovery of their stretched rectangular specimens are measured. The S-shaped thermally stimulated recovery curves are characterized by the maximum recovery( R f ) the recovery temperature( T r ) and the recovery velocity( V r ). The changes of these characteristic parameters show that the features of thermally stimulated shape memory effects of EOET segmented copolymers are as follows: The crystallinity of soft segments determines the recovery temperature. The maximum recovery and the recovery velocity depend on the stability of the physical crosslinks formed by the hard segments.At the same time they are influenced by the length of the soft segments,which is due to the entropic nature of the soft segment deformation recovery. |
| Keywords: | ethylene oxide-ethylene terephthalate copolymmer shape memory long soft segment |
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