title: Dually actuated triple shape memory polymers of cross-linked polycyclooctene-carbon nanotube/polyethylene nanocomposites.
abstract: In this work, electrically and thermally actuated triple shape memory polymers (SMPs) of chemically cross-linked polycyclooctene (PCO)-multiwalled 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' 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 (vPCO) of ca. 40-70 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.
authors.affiliation: Department of Polymer Science and Engineering, School of Chemistry and Biological Engineering, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.
authors.forename: Zhenwen
authors.initials: Z
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Min
authors.initials: M
authors.lastname: Chen
authors.forename: Minhao
authors.initials: M
authors.lastname: Yang
authors.forename: Luyang
authors.initials: L
authors.lastname: Tang
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Dang
authors.forename: Fenghua
authors.initials: F
authors.lastname: Chen
authors.forename: Miaoming
authors.initials: M
authors.lastname: Huang
authors.forename: Xia
authors.initials: X
authors.lastname: Dong
mesh_terms: D002152:Calorimetry, Differential Scanning; D034242:Cyclooctanes / Q000737:chemistry; D004560:Electricity; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D020959:Polyethylene / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D034242:Cyclooctanes; D037742:Nanotubes, Carbon; D011108:Polymers; D020959:Polyethylene
keywords: co-continuous structure; electrical actuation; nanocomposites; polyolefins; selective distribution; triple shape memory effects