Luo Haiya, Liu Yan, Yu Zhijun, Zhang Sheng, Li Bangjing
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
Biomacromolecules. 2008 Oct;9(10):2573-7. doi: 10.1021/bm8004726. Epub 2008 Sep 18.
A novel shape memory material was prepared based on the formation of inclusion complexes between alpha-cyclodextrin (alpha-CD) and poly(epsilon-caprolactone) (PCL); the PCL-alpha-CD inclusion crystallites serve as a fixing phase, while free PCL crystallites serve as a reversible phase. The characteristics of the material were investigated and a mechanism for the shape memory behavior was proposed. This material showed good shape memory properties, with the recovery ratio exceeding 90% and the recovery time being less than 6 s at 90 degrees C. This PCL-alpha-CD partial inclusion complex lost about 50% (47.4 +/- 4.4%) weight within 45 days in presence of lipase, indicating its degradability. The shape memory and biodegradation properties of the well-designed polymer-alpha-CD complexes indicate great promise for this novel shape memory material.
基于α-环糊精（α-CD）与聚己内酯（PCL）之间形成包合物制备了一种新型形状记忆材料；PCL-α-CD包合微晶作为固定相，而游离的PCL微晶作为可逆相。研究了该材料的特性，并提出了形状记忆行为的机理。该材料表现出良好的形状记忆性能，在90℃时恢复率超过90%，恢复时间小于6秒。这种PCL-α-CD部分包合物在脂肪酶存在下45天内失重约50%（47.4±4.4%），表明其具有可降解性。精心设计的聚合物-α-CD复合物的形状记忆和生物降解性能表明这种新型形状记忆材料具有巨大的应用前景。
