Fully Biobased Shape Memory Material Based on Novel Cocontinuous Structure in Poly(Lactic Acid)/Natural Rubber TPVs Fabricated via Peroxide-Induced Dynamic Vulcanization and in Situ Interfacial Compat

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• 作者：Daosheng Yuan ; Zhonghua Chen ; Chuanhui Xu ; Kunling Chen ; Yukun Chen
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：November 2, 2015
• 年：2015
• 卷：3
• 期：11
• 页码：2856-2865
• 全文大小：844K
• ISSN：2168-0485

文摘

Shape memory polymers (SMPs) based on fully biobased poly(lactide) (PLA)/natural rubber (NR) thermoplastic vulcanizates (TPVs) were fabricated via peroxide-induced dynamic vulcanization. Simultaneously, in situ reactive compatibilization was achieved by PLA molecule grafting onto NR chains. Differing from the general concept of spherical rubber particles being formed after dynamic vulcanization, the cross-linked NR was found to be a 鈥渘etlike鈥?continuous phase in the PLA matrix. This novel structure explained the surprising shape memory property of PLA/NR TPVs well (shape fixities 鈭?100%, shape recoveries > 95%, and fast recovery speed < 15 s at the switching temperature, 鈭?0 掳C): the cross-linked NR continuous phase offers strong resilience and the PLA phase serves as the heat-control switch. We envision that the 鈥済reen鈥?raw materials and excellent shape memory properties of the dynamically vulcanized PLA/NR SMPs will open up a wide range of potential applications in intelligent medical devices.