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Journal of Polymer Research
Erschienen in: Journal of Polymer Research 10/2017

01.09.2017 | ORIGINAL PAPER

Triple-shape memory properties of thermoplastic polyurethane/olefin block copolymer/polycaprolactone blends

verfasst von: S.-M. Lai, Pei-Yun You, Yu Ting Chiu, Chia Wen Kuo

Erschienen in: Journal of Polymer Research | Ausgabe 10/2017

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Abstract

Thermoplastic polyurethane (TPU)/olefin block copolymer (OBC)/polycaprolactone (PCL) blends (70/20/10 and 50/30/20) were melt-blended to form the first environmental OBC-based triple-shape memory polymer blends. In this work, PCL with low crystalline temperature (switching phase), OBC with medium crystalline temperature (switching phase), and TPU with high crystalline temperature (fixed phase) could form an alternative triple-shape memory polymer (TSMP). Two compatibilizers, OBC-g-glycidyl methacrylate (OBC-g-GMA) and dicumyl peroxide, were confirmed to show a synergistic effect in enhancing the compatibility further through the morphological observation. Crystallinity of both OBC and PCL in the blends with or without modification decreased in comparison with that of pure resin. For dual-shape behaviors, the shape fixing ratio (Rf) and shape recovery ratio (Rr) were up to 96.3% and 91.2% for the GMA and peroxide-modified blends (50/30/20). The higher amount of TPU didn’t give higher recovery ratio, but instead slightly lower Rr due to the morphology difference. For triple-shape behaviors, both TPU/OBC/PCL blend compositions with or without GMA or peroxide modifications gave high Rf(C→B) values in the first fixing stage, but slightly lower values Rf(B→A) in the second fixing stage, especially for (70/20/10) case. On the other hand, a reverse trend was observed for two recovery stages. To enhance the Rf(B→A) in the second fixing stage, higher deformation temperatures were considered, and a measurable increment on Rf(B→A) was attained. Through this subtle adjustment on the temperature difference between high and low deformation temperatures, the theoretical multi-shape memory shape could be readily tailored to meet different applications.
Vorheriger Artikel Disperse-within-disperse patterning on ternary/binary mixed-brush single crystals using polyaniline, polystyrene and poly(methyl methacrylate) grafts
Nächster Artikel Copolymers of ε-caprolactam and polypropylene oxide via anionic polymerization: synthesis and properties

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Metadaten
Titel
Triple-shape memory properties of thermoplastic polyurethane/olefin block copolymer/polycaprolactone blends
verfasst von
S.-M. Lai
Pei-Yun You
Yu Ting Chiu
Chia Wen Kuo
Publikationsdatum
01.09.2017
Verlag
Springer Netherlands
Erschienen in
Journal of Polymer Research / Ausgabe 10/2017
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI
https://doi.org/10.1007/s10965-017-1319-z

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