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Triple-shape memory effects of modified semicrystalline ethylene-propylene-diene rubber/poly(epsilon-caprolactone) blends

Title
Triple-shape memory effects of modified semicrystalline ethylene-propylene-diene rubber/poly(epsilon-caprolactone) blends
Author
장영욱
Keywords
Supramolecular hydrogen-bonded elastomer; Triple-shape memory effects; Poly(epsilon-caprolactone); Multiple crystalline; Blends; HYDROGEN-BONDING NETWORKS; POLYMER NETWORKS; CROSS-LINKING; COMPOSITES; NANOCOMPOSITES; ELASTOMER; MECHANISM
Issue Date
2015-09
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
EUROPEAN POLYMER JOURNAL, v. 70, Page. 306-316
Abstract
Triple-shape memory polymers (T-SMPs) were prepared by melt blending of a 3-amino-1,2,4-triazole modified semicrystalline maleated ethylene-propylene-diene rubber (A-EPDM), which forms a supramolecular hydrogen-bonded network, with poly(epsilon-caprolactone) (PCL). The effect of PCL content (10-50 wt%) on the thermomechanical and triple-shape memory properties of the A-EPDM/PCL blends was investigated. Scanning electron micrographs showed a phase-separated morphology, in which PCL phase was dispersed in a continuous A-EPDM matrix. Fourier transform infrared spectroscopy and differential scanning calorimetry results revealed a certain degree of compatibility between A-EPDM and PCL in the blends. Dynamic mechanical analysis of the blends showed that the blends form a physically crosslinked network structure and there are sudden drops in the storage modulus at well-separated temperatures in the range of 20-140 degrees C corresponding to the crystalline melting transition of each component in the blends. These structural features of the blend two well-separated crystalline melting transitions within a physically crosslinked network enable this blend system to exhibit triple-shape memory behavior with two different stages of temporary shape fixing and then step-wise shape recovery. These blend-based T-SMPs show melt processability and recyclability. (C) 2015 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0014305715003742http://hdl.handle.net/20.500.11754/39308
ISSN
0014-3057; 1873-1945
DOI
10.1016/j.eurpolymj.2015.07.026
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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