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| The Crystalization of Soft Segment of Thermal Sensitive Polyurethane and Its Intelligent Properties |
| ZHOU Hu1, ZENG Jianxian1, CHEN Dengchu1, FAN Haojun2, ZENG Junchang1 |
1.School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201
2.National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065 |
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Cite this article:
ZHOU Hu ZENG Jianxian CHEN Dengchu FAN Haojun ZENG Junchang. The Crystalization of Soft Segment of Thermal Sensitive Polyurethane and Its Intelligent Properties. Chin J Mater Res, 2010, 24(6): 579-584.
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Abstract A thermal sensitive polyurethane (TSPU) membrane was prepared by two-step polymerization in solvent and the crystallization of soft segment was analyzed. The results reveal that TSPU shows an obvious phase-separated structure and a phase transition temperature of the soft segment (defined as switch temperature, Ts). The switch temperature (Ts) and the thermal sensitivity of TSPU still remain available after thermal cyclic process. Moreover, when the temperature was lower than the Ts, the crystal of the soft segment was visible, but when the temperature exceeded the phase transition temperature of soft segment, the crystal of the soft segment melted and disappeared. As a result, the average radius (R) of the free volume holes and water vapor permeability of TSPU membrane showed a response to thermal stimuli. The phase transition of the soft segment controlled the significant change in free volume hole size and WVP, and the process mentioned above was stimulated by the external temperature.
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Received: 21 April 2010
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| Fund: Supported by the Development Program of China (863 Program, No.2007AA03Z341) and National Natural Science Foundation of China Nos.21006022 and 20976040. |
| [1] Y.Chen, Y.Liu, H.J.Fan, Hui Li, Bi Shi, H.Zhou, B.Y.Peng, The polyurethane membranes with temperature sensitivity for water vapor permeation, Journal of Membrane Science, 287, 192(2007)
[2] H.M.Jeong, J.B.Lee, S.Y.Lee, B.K.Kim, Shape memory polyurethane containing mesogenic moiety, Journal of Materials Science, 35, 279(2000)
[3] X.M.Ding, J.L.Hu, X.M.Tao, Effect of crystal melting on water vapor permeability of shape memory polyurethane film, Textiles Research Journal, 74, 39(2004)
[4] H.M.Jeong, B.K.Ahn, S.M.Cho, B.K.Kim, Water vapor permeability of shape memory polyurethane with amorphous reversible phase, Journal of Polymer Science: Part B: Polymer Physics, 38, 3009(2000)
[5] H.J.Fan, L.Li, X.N.Fan, B.Shi, The water vapor permeability of leather finished by thermo-responsive polyurethane, Journal of the Society of Leather Technologists and Chemists, 89, 121(2005)
[6] B.K.Kim, S.Lee, Y.Xu, Polyurethanes having shape memory effects, Polymer, 37, 5781(1993)
[7] B.K.Kim, S.Y.Lee, J.S.Lee, Polyurethane ionomers having shape memory effects, Polymer, 39, 2803(1998)
[8] S.Hayashi, N.Ishikawa, C.Giordano, High Moisture permeability Polyurethane for Textile Application, Journal of Coated Fabric, 23, 74(1993)
[9] W.Y.Jeong, S.K.An, The transport properties of polymer membrane-fabric composites, Journal of Materials Science, 36, 4797(2001)
[10] Y.C.Jean, J.P.Yuan, J.Liu, H.J.Yang, Correlations between gas permeation and free- 33 hole properties probed by position annihilation spectroscopy, Journal of Polymer Science: Part B: Polymer Physics, 33, 2365(1995)
[11] H.Nakanishi, S.J.Wang, Y.C.Jean, Positron Annihilation Studies of Fluids (Singapore, World Science, 1988) p.81
[12] S.Mondal, J.L.Hu, Water vapor permeability of cotton fabrics coated with shape memory polyurethane, Carbohydrate Polymers, 25, 124(2006)
[13] I.Yilgor, Textiles coated with waterproof, moisture vapor permeable polymers, US patent, 5, 389, 430(1995)
[14] H.Yin, Z.J.Yin, W.T.Ma, D.M.Zhu, A review of studies of polymeric membranes by positron annihilation lifetime spectroscopy, Plasma Science and Technology, 7(5), 56(2005) |
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