| Temperature Dependency of Water Vapor Permeability of Shape Memory Polyurethane |
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| 引用本文： | 曾跃民,胡金莲,严灏景. Temperature Dependency of Water Vapor Permeability of Shape Memory Polyurethane[J]. 东华大学学报(英文版), 2002, 19(3) |
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| 作者姓名： | 曾跃民 胡金莲 严灏景 |
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| 作者单位： | ZENG Yue-min，HU Jin-lian 2，YAN Hao-jing 1College of Textiles，Dong Hua University，Shanghai，200051 2 Institute of Textiles and Clothing，The Hong Kong Polytechnic University，Hong Kong |
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| 基金项目： | TheHongKongPolytechnicUniversity (A .14 .37.PB5 3) |
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| 摘 要： | ＩｎｔｒｏｄｕｃｔｉｏｎＰｈａｓｅｔｒａｎｓｉｔｉｏｎａｃｃｏｍｐａｎｉｅｓｓｉｇｎｉｆｉｃａｎｔｃｈａｎｇｅｉｎｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｐｏｌｙｍｅｒ.Ａｌａｒｇｅｄｒｏｐｏｆｍｏｄｕｌｕｓａｎｄｅｎｈａｎｃｅｄｍｉ ｃｒｏ Ｂｒｏｗｎｉａｎｍｏｔｉｏｎｏｎｈｅａｔｉｎｇｔｈｒｏｕｇｈｇｌａｓｓｔｒａｎｓｉｔｉｏｎｏｒｍｅｌｔｉｎｇｔｅｍｐｅｒａｔｕｒｅｃａｎｂｅｕｓｅｄｉｎｔｈｅｍｏｌｅｃｕｌａｒｄｅｓｉｇｎｏｆｓｈａｐｅｍｅｍｏｒｙｐｏｌｙｕｒｅｔｈａｎｅ (ＳＭＰＵ ) .Ａ…
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Temperature Dependency of Water Vapor Permeability of Shape Memory Polyurethane |
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| ZENG Yue-min,HU Jin-lian,YAN Hao-jing. Temperature Dependency of Water Vapor Permeability of Shape Memory Polyurethane[J]. Journal of Donghua University, 2002, 19(3) |
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| Authors: | ZENG Yue-min HU Jin-lian YAN Hao-jing |
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| Affiliation: | 1. College of Textiles, Dong Hua University, Shanghai, 200051
2. Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong |
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| Abstract: | Solution-cast films of shape memory polyurethane have been investigated.Differential scanning calorimetry, DMA, tensile test, water vapor permeability and the shape memory effect were carried out to characterize these polyurethane membranes. Samples cast at higher temperatures contained more hard segment in the crystalline state than a sample cast at lower temperature. The change in the water vapor permeability (WVP) of SMPU films with respect to the temperature follows an S-shaped curve, and increases abruptly at T m of the soft segment for the fractional free volume (FFV, the ratio of free volume and specific volume in polymers) increased linearly with temperature. The water vapor permeability dependency of the temperature and humidity contribute to the result of the change of diffusion and solubility with the surrounding air condition. The diffusion coefficient (D) are the function of temperature and show good fit the Arrhenius form but show different parameter values when above and below T g. The crystalline state hard-segment is necessary for the good shape memory effect |
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| Keywords: | polyurethane water vapor permeability temperature dependency shape memory. |
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