Shape-memory effects of radiation crosslinked poly(ε-caprolactone)
Shape-memory effects of radiation crosslinked poly(ε-caprolactone)
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DOI：
10.1002/app.12736
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发表时间：
2003-11-07
影响因子：
3
通讯作者：
Yu, Q
中科院分区：
文献类型：
--
作者：
Zhu, G;Liang, G;Yu, Q
采用γ射线辐射交联不同分子量的聚己内酯（PCL）。采用甲苯索氏抽提和Charlesby-Pinner方程分析了辐射交联特性。交联度与分子量和辐射剂量有关，溶胶分数与辐射剂量的关系符合Charlesby-Pinner方程。所有样品在室温下均为结晶态，辐射交联对PCL的结晶度和熔融行为影响不大。形状记忆的结果表明，只有那些具有足够高的交联度（凝胶含量高于约10%）的试样能够显示出典型的形状记忆效应，大的可恢复应变，和高的最终恢复率。回复效应的响应温度（约55 ℃）与样品的熔点有关。PCL形状记忆聚合物具有回复温度低、回复变形大的特点，这是由于PCL中含有脂肪族聚酯链的缘故。(C)2003 Wiley Periodicals，Inc.
Poly(epsilon-caprolactone) (PCL) with different molecular weight were crosslinked by gamma-radiation. The radiation crosslinking features were analyzed by Soxhlet extraction with toluene and the Charlesby-Pinner equation. The crosslinking degree is relative to molecular weight and radiation dose; the relation between sol fraction and dose follows the Charlesby-Pinner equation. All the samples were crystalline at room temperature, and the radiation crosslinking had a little effect on the crystallinity and the melting behavior of PCL. The shape-memory results indicated that only those specimens that had a sufficiently high crosslinking degree (gel content is higher than about 10%) were able to show the typical shape-memory effect, a large recoverable strain, and a high final recovery rate. The response temperature of the recovery effect (about 55degreesC) was related to the melting point of the samples. The PCL shape-memory polymer was characterized by its low recovery temperature and large recovery deformation that resulted from the aliphatic polyester chain of PCL. (C) 2003 Wiley Periodicals, Inc.