Effect of glycerol cross-linking and hard segment content on the shape memory property of polyurethane block copolymer |
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Authors: | Byoung Chul Chun Mi Hwa Chong Yong-Chan Chung |
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Affiliation: | (1) Department of Polymer Engineering, The University of Suwon, Hwasungshi, Korea;(2) Department of Chemistry, The University of Suwon, Hwasungshi, Korea;(3) Intelligent Textile System Research Center, Seoul, Korea |
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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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Keywords: | |
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