Effect of cross-linking agent structure on the shape memory property of polyurethane block copolymer |
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| Authors: | Yong-Chan Chung Jae Won Choi Soyun Moon Byoung Chul Chun |
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| Institution: | (1) Department of Chemistry, The University of Suwon, Hwasungshi, South Korea;(2) Department of Polymer Engineering, The University of Suwon, Hwasungshi, South Korea; |
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| Abstract: | Effect of cross-linking agent on the shape memory and mechanical property of polyurethane (PU) block copolymer is comprehensively
investigated. The selected chemical cross-linking agents are glycerol, 1,2,6-trihydroxyhexane, and 2,4,6-trihydroxybenzaldehyde
that are differentiated from each other in having remote hydroxyl group and aromatic ring. Significant increase in maximum
stress was observed for all of the cross-linked PUs, although the cross-linker structure was different. Structural change
of PU after cross-linking as evidenced by differential scanning calorimetry and infrared spectra was not detected, suggesting
that interaction between PU chains remained intact. Shape recovery went to as high as 95 % after cross-linking for all of
the cross-linking agents, and shape retention did not improve even if cross-linker was used. The remarkable increase in shape
recovery and maximum stress definitely originated from the employment of a cross-linking agent, and the effect of different
cross-linker structure on shape memory and mechanical property is discussed. |
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