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Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane

Star-shaped cyclophosphazene (ACP) was employed as covalent crosslinker to form a rigid segment in polyurethanes network, to enhance the mechanical performance and to add extra flame retardant property. The effects of different ACP contents on the shape memory ability and fire resistance performance...

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Detalles Bibliográficos
Autores principales: Song, Xiuhuan, Chi, Hong, Li, Zibiao, Li, Tianduo, Wang, FuKe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7240373/
https://www.ncbi.nlm.nih.gov/pubmed/32224862
http://dx.doi.org/10.3390/polym12040740
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author Song, Xiuhuan
Chi, Hong
Li, Zibiao
Li, Tianduo
Wang, FuKe
author_facet Song, Xiuhuan
Chi, Hong
Li, Zibiao
Li, Tianduo
Wang, FuKe
author_sort Song, Xiuhuan
collection PubMed
description Star-shaped cyclophosphazene (ACP) was employed as covalent crosslinker to form a rigid segment in polyurethanes network, to enhance the mechanical performance and to add extra flame retardant property. The effects of different ACP contents on the shape memory ability and fire resistance performance of polyurethane (PU) were studied. Tensile tests suggested high flexibility of the PUs with the maximum elongation-at-break of 161.59%. Dynamic mechanical analysis (DMA) indicated good shape recovery ratio of 72.58% after more than three repeated cycles. Under thermal treatment, the temporary shape could recover to its original state in 10 s. The peak heat release rate (pHRR), total heat released (THR) and temperature at pHRR (T(p)) of flame-retardant shape memory polyurethane (FSPU) by micro-combustion calorimeter (MCC) was as low as 183.2 W/g, 21.4 KJ/g, 330.8 °C respectively, suggesting good inherent fire-resistant performance. As amine-containing crosslinkers are one of the most common building units in thermosetting polymers, we anticipate that our finding will have significant benefits beyond shape memory and fire-resistance.
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spelling pubmed-72403732020-06-02 Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane Song, Xiuhuan Chi, Hong Li, Zibiao Li, Tianduo Wang, FuKe Polymers (Basel) Article Star-shaped cyclophosphazene (ACP) was employed as covalent crosslinker to form a rigid segment in polyurethanes network, to enhance the mechanical performance and to add extra flame retardant property. The effects of different ACP contents on the shape memory ability and fire resistance performance of polyurethane (PU) were studied. Tensile tests suggested high flexibility of the PUs with the maximum elongation-at-break of 161.59%. Dynamic mechanical analysis (DMA) indicated good shape recovery ratio of 72.58% after more than three repeated cycles. Under thermal treatment, the temporary shape could recover to its original state in 10 s. The peak heat release rate (pHRR), total heat released (THR) and temperature at pHRR (T(p)) of flame-retardant shape memory polyurethane (FSPU) by micro-combustion calorimeter (MCC) was as low as 183.2 W/g, 21.4 KJ/g, 330.8 °C respectively, suggesting good inherent fire-resistant performance. As amine-containing crosslinkers are one of the most common building units in thermosetting polymers, we anticipate that our finding will have significant benefits beyond shape memory and fire-resistance. MDPI 2020-03-26 /pmc/articles/PMC7240373/ /pubmed/32224862 http://dx.doi.org/10.3390/polym12040740 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 Article
Song, Xiuhuan
Chi, Hong
Li, Zibiao
Li, Tianduo
Wang, FuKe
Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane
title Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane
title_full Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane
title_fullStr Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane
title_full_unstemmed Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane
title_short Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane
title_sort star-shaped crosslinker for multifunctional shape memory polyurethane
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7240373/
https://www.ncbi.nlm.nih.gov/pubmed/32224862
http://dx.doi.org/10.3390/polym12040740
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