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Effect of glycerol cross-linking and hard segment content on the shape memory property of polyurethane block copolymer

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Abstract

Effect of glycerol cross-linking and hard segment content on the shape memory property of polyurethane block copolymer is comprehensively investigated. Phase separation of hard and soft segment is dependent on glycerol cross-linking and hard segment content as judged from FT-IR and DSC data. Hydrogen bonding and dipole–dipole interaction between hard segments provides strong interaction between copolymer chains in addition to chemical cross-linking by glycerol. As the hard segment content increases, the copolymer shows better tensile mechanical properties and higher melting temperature of soft segment (T m). Effect of glycerol cross-linking on mechanical properties and T m of soft segment is low compared to hard segment effect. Although XRD peak at 2θ = 19.5° is observed, clear difference between the copolymers with various hard segment and cross-linking content is not observed. Significant increase in shape recovery rate in the case of 30 wt% hard segment copolymer is observed after glycerol cross-linking. The drastic change of the properties of polyurethane block copolymer is discussed in the point of copolymer chain interaction.

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Acknowledgements

The authors of this paper would like to thank the Korea Science and Engineering Foundation (KOSEF) for sponsoring this research through the SRC/ERC Program of MOST/KOSEF (R11-2005-065).

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Authors and Affiliations

  1. Department of Polymer Engineering, The University of Suwon, Hwasungshi, Korea

    Byoung Chul Chun & Mi Hwa Chong

  2. Department of Chemistry, The University of Suwon, Hwasungshi, Korea

    Yong-Chan Chung

  3. Intelligent Textile System Research Center, Seoul, Korea

    Byoung Chul Chun, Mi Hwa Chong & Yong-Chan Chung

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  1. Byoung Chul Chun
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  2. Mi Hwa Chong
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  3. Yong-Chan Chung
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Correspondence to Byoung Chul Chun.

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Chun, B.C., Chong, M.H. & Chung, YC. Effect of glycerol cross-linking and hard segment content on the shape memory property of polyurethane block copolymer. J Mater Sci 42, 6524–6531 (2007). https://doi.org/10.1007/s10853-007-1568-z

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  • DOI: https://doi.org/10.1007/s10853-007-1568-z

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