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Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane

We investigated the shape-recovery characteristics of thermoplastic polyurethane (TPU) with a microcellular foaming process (MCP). Additionally, we investigated the correlation between changes in the microstructure and the shape-recovery characteristics of the polymers. TPU was selected as the base...

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Detalles Bibliográficos
Autores principales: Yun, Chang-Seok, Sohn, Joo Seong, Cha, Sung Woon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7077500/
https://www.ncbi.nlm.nih.gov/pubmed/32041158
http://dx.doi.org/10.3390/polym12020351
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author Yun, Chang-Seok
Sohn, Joo Seong
Cha, Sung Woon
author_facet Yun, Chang-Seok
Sohn, Joo Seong
Cha, Sung Woon
author_sort Yun, Chang-Seok
collection PubMed
description We investigated the shape-recovery characteristics of thermoplastic polyurethane (TPU) with a microcellular foaming process (MCP). Additionally, we investigated the correlation between changes in the microstructure and the shape-recovery characteristics of the polymers. TPU was selected as the base material, and the shape-recovery characteristics were confirmed using a universal testing machine, by manufacturing dog-bone-type injection-molded specimens. TPUs are reticular polymers with both soft and hard segments. In this study, we investigated the shape-memory mechanism of foamed polymers by maximizing the shape-memory properties of these polymers through a physical foaming process. Toward this end, TPU specimens were prepared by varying the gas pressure, foaming temperature, and type of foaming gas in the batch MCP. The effects of internal structural changes were investigated. These experimental variables affected the microstructure and shape-recovery characteristics of the foamed polymer. The generated cell density changed, which affected the shape-recovery characteristics. In general, a higher cell density corresponded to a higher shape-recovery ratio.
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spelling pubmed-70775002020-03-20 Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane Yun, Chang-Seok Sohn, Joo Seong Cha, Sung Woon Polymers (Basel) Communication We investigated the shape-recovery characteristics of thermoplastic polyurethane (TPU) with a microcellular foaming process (MCP). Additionally, we investigated the correlation between changes in the microstructure and the shape-recovery characteristics of the polymers. TPU was selected as the base material, and the shape-recovery characteristics were confirmed using a universal testing machine, by manufacturing dog-bone-type injection-molded specimens. TPUs are reticular polymers with both soft and hard segments. In this study, we investigated the shape-memory mechanism of foamed polymers by maximizing the shape-memory properties of these polymers through a physical foaming process. Toward this end, TPU specimens were prepared by varying the gas pressure, foaming temperature, and type of foaming gas in the batch MCP. The effects of internal structural changes were investigated. These experimental variables affected the microstructure and shape-recovery characteristics of the foamed polymer. The generated cell density changed, which affected the shape-recovery characteristics. In general, a higher cell density corresponded to a higher shape-recovery ratio. MDPI 2020-02-06 /pmc/articles/PMC7077500/ /pubmed/32041158 http://dx.doi.org/10.3390/polym12020351 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Yun, Chang-Seok
Sohn, Joo Seong
Cha, Sung Woon
Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane
title Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane
title_full Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane
title_fullStr Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane
title_full_unstemmed Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane
title_short Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane
title_sort shape-memory-recovery characteristics of microcellular foamed thermoplastic polyurethane
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7077500/
https://www.ncbi.nlm.nih.gov/pubmed/32041158
http://dx.doi.org/10.3390/polym12020351
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