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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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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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. |
format | Online Article Text |
id | pubmed-7077500 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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