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Grafting of Triphenylmethyl Group onto Polyurethane and the Impact on the Shape Recovery and Flexibility at Extremely Low Temperature

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Abstract

The bulky and rigid triphenylmethyl group was grafted onto polyurethane (PU) to reduce the molecular attractions between hard segments and to improve the mobility of the PU chain under freezing conditions. The triphenylmethyl-grafted PU exhibited improvement in the cross-link density, solution viscosity, maximum tensile stress, shape recovery at 10 °C, and low temperature flexibility compared with the plain PU. The soft segment melting was not affected by the grafted triphenylmethyl group, whereas the soft segment crystallization disappeared with the increase of the triphenylmethyl group content. The glass transition temperature (Tg) increased with the increase of the triphenylmethyl group content. The rapid increase of the tensile strength and shape recovery at 10 °C resulted from the cross-linking effect, whereas the strain at break and shape retention at -25 °C slightly decreased with the increase of the triphenylmethyl group content. The triphenylmethylgrafted PU displayed an excellent low temperature flexibility even at -50 °C due to the improved mobility of the PU chain compared to ordinary PU.

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Authors and Affiliations

  1. School of Nano Engineering, Inje University, Gimhae, 50834, Korea

    Sang Hyeon Kim, Jin Cheol Bae & Byoung Chul Chun

  2. Department of Chemistry, The University of Suwon, Hwaseong, 18323, Korea

    Yong-Chan Chung

Authors
  1. Yong-Chan Chung
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  2. Sang Hyeon Kim
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  3. Jin Cheol Bae
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  4. Byoung Chul Chun
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Correspondence to Byoung Chul Chun.

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Chung, YC., Kim, S.H., Bae, J.C. et al. Grafting of Triphenylmethyl Group onto Polyurethane and the Impact on the Shape Recovery and Flexibility at Extremely Low Temperature. Fibers Polym 19, 1157–1165 (2018). https://doi.org/10.1007/s12221-018-8082-6

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  • DOI: https://doi.org/10.1007/s12221-018-8082-6

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