[비의류제품] Influence of Processing Conditions on the Microstructure and Properties of Shape Memory Polyurethane Membranes 출판일 : 2003.02.01 저자 : J.L. Hu, Y.M. Zeng, H.J. Yan 서지사항 : Textile Research Journal, Volume 73, No 2(2003), 172-178 페이지 등록일 : 2012.06.27 I 조회수 : 215 작성자 : admin |
Solution-cast films of shape memory polyurethane are investigated by Fourier trans form
infrared spectroscopy, differential scanning calorimetry, dynamic mechanical anal ysis,
tensile properties, water vapor permeability, and shape memory effect tests. Samples cast at
higher temperatures contain more hard segments in the crystalline state and better water
vapor permeability than samples cast at lower temperatures. The change in water vapor
permeability of shape memory polyurethane films with respect to temperature follows an S-
shaped curve, and increases abruptly at Ts, the shape memory temperature of the soft
segment. The higher the modulus ratio at two specified temperatures before and after Ts,
the better the shape memory behavior of shape memory polyurethane.
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