Biobased Heat-Triggered Shape-Memory Polymers Based on Polylactide/Epoxidized Natural Rubber Blend System Fabricated via Peroxide-Induced Dynamic Vulcanization: Co-continuous Phase Structure, Shape Memory Behavior, and Interfacial Compatibilization
Biobased Heat-Triggered Shape-Memory Polymers Based on Polylactide/Epoxidized Natural Rubber Blend System Fabricated via Peroxide-Induced Dynamic Vulcanization: Co-continuous Phase Structure, Shape Memory Behavior, and Interfacial Compatibilization
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DOI：
10.1021/acs.iecr.5b02195
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发表时间：
2015-09-09
影响因子：
4.2
通讯作者：
Xu, Chuanhui
中科院分区：
文献类型：
--
作者：
Chen, Yukun;Chen, Kunling;Xu, Chuanhui
采用过氧化氢诱导动态硫化法制备了由聚乳酸(PLA)和环氧化天然橡胶(ENR)组成的生物基热触发形状记忆聚合物(HSMP)。与传统的橡胶/橡胶体系中硫化橡胶粒子分散在塑料中形成典型的“海岛”形态不同，交联型ENR相呈现出嵌入在聚乳酸相中的连续网状结构。FTIR分析证实了原位界面增容作用。与聚乳酸(60~70%)相比，聚乳酸/环氧氯丙烷/环氧氯丙烷复合材料的形状恢复率显著提高了90%以上。聚乳酸/环氧乙烷橡胶HSMPs的定形和记忆能力是通过聚乳酸相的玻璃化转变实现的：橡胶状态下的交联型环氧氯丙烷连续相提供了强大的回复驱动力，改进的界面在形状恢复过程中提供了有效的应力传递，而聚乳酸连续相起到了恢复的“控制开关”的作用。基于生物基的聚乳酸/ENR HSMP可以作为智能生物医疗设备的传统材料的一种有前途的替代品。
A biobased heat-triggered shape-memory polymer (HSMP) consisting of polylactide (PLA) and epoxidized natural rubber (ENR) was fabricated by peroxide-induced dynamic vulcanization. The cross-linked ENR phase exhibits a continuous net-like structure embedded in the PLA phase, which is different from a conventional plastic/rubber system having the typical "sea-island" morphology in which vulcanized rubber particles were dispersed in plastic matrix. In situ interfacial compatibilization was confirmed by FTIR analysis. The shape-recovery ratios of the PLA/ENR HSMPs were significantly improved over 90%, compared to that (60-70%) of PLA. The shape fixing and memorizing capability of PLA/ENR HSMPs was realized by the glass transition of the PLA phase: cross-linked ENR continuous phase at rubbery state offered strong recovery driving force, improved interface provided effective stress-transferring during shape recovery, and PLA continuous phase served as a "control-switch" for recovery. The biobased PLA/ENR HSMP could serve as a promising alternative to the traditional materials for intelligent biomedical devices.