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Open AccessArticle

Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane

1
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
2
Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Fusionopolis Way, Innovis, #08-03, Singapore 138634, Singapore
*
Authors to whom correspondence should be addressed.
Polymers 2020, 12(4), 740; https://doi.org/10.3390/polym12040740
Received: 18 February 2020 / Revised: 24 March 2020 / Accepted: 24 March 2020 / Published: 26 March 2020
(This article belongs to the Collection Design and Synthesis of Polymers)
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 (Tp) 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. View Full-Text
Keywords: polyurethanes; shape memory; crosslinker; cyclophosphazene; flame retardance polyurethanes; shape memory; crosslinker; cyclophosphazene; flame retardance
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MDPI and ACS Style

Song, X.; Chi, H.; Li, Z.; Li, T.; Wang, F. Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane. Polymers 2020, 12, 740.

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