Dually Actuated Triple Shape Memory Polymers of Cross-Linked Polycyclooctene鈥揅arbon Nanotube/Polyethylene Nanocomposites

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• 作者：Zhenwen Wang ; Jun Zhao ; Min Chen ; Minhao Yang ; Luyang Tang ; Zhi-Min Dang ; Fenghua Chen ; Miaoming Huang ; Xia Dong
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：November 26, 2014
• 年：2014
• 卷：6
• 期：22
• 页码：20051-20059
• 全文大小：526K
• ISSN：1944-8252

文摘

In this work, electrically and thermally actuated triple shape memory polymers (SMPs) of chemically cross-linked polycyclooctene (PCO)鈥搈ultiwalled carbon nanotube (MWCNT)/polyethylene (PE) nanocomposites with co-continuous structure and selective distribution of fillers in PCO phase are prepared. We systematically studied not only the microstructure including morphology and fillers鈥?selective distribution in one phase of the PCO/PE blends, but also the macroscopic properties including thermal, mechanical, and electrical properties. The co-continuous window of the immiscible PCO/PE blends is found to be the volume fraction of PCO (v^PCO) of ca. 40鈥?0 vol %. The selective distribution of fillers in one phase of co-continuous blends is obtained by a masterbatch technique. The prepared triple SMP materials show pronounced triple shape memory effects (SMEs) on the dynamic mechanical thermal analysis (DMTA) and the visual observation by both thermal and electric actuations. Such polyolefin samples with well-defined microstructure, electrical actuation, and triple SMEs might have potential applications as, for example, multiple autochoke elements for engines, self-adjusting orthodontic wires, and ophthalmic devices.

Keywords:

electrical actuation; triple shape memory effects; polyolefins; nanocomposites; co-continuous structure; selective distribution