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Textile Research Journal
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Preparation of Temperature-Sensitive Polyurethanes for Smart Textiles

X. M. Ding

Fashion Art & Design Institute, Dong Hua University, Shanghai, PR China, fddingxm{at}dhu.edu.cn

J. L. Hu

Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong, PR China

X. M. Tao

Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong, PR China

C. P. Hu

Institute of Material Science and Engineering, East China University of Science and Technology, Shanghai, PR China

A series of segmented polyurethane (PU) were prepared using five different polyols and hexamethylene diisocyanate (HDI) as mixing soft segment, 4,4'-diphenylmethane diisocyanate, hydrophilic segment poly (ethylene glycol) 200 (PEG 200) and chain extender 1,4-butanediol (1,4-BDO) as triblock hard segment. The micro-structure of the PUs was investigated by differential scanning calorimetry, wide-angle X-ray, and polarizing microscopy. Tensile property was measured, and the water vapor transport property of the PU membranes as a function of temperature was tested accordingly. It was found that the PUs with crystalline soft segments were temperature-sensitive; that is, crystal melting of soft segment results in the significant increase in water vapor permeability of the PU membranes. Proper molecule design can set switch temperature ranges in water vapor permeability of the membranes from 10 to 40°C including body temperature. Such properties can contribute to the development of smart textiles.

Key Words: temperature-sensitive • polyurethanes • smart textiles

Textile Research Journal, Vol. 76, No. 5, 406-413 (2006)
DOI: 10.1177/0040517506063389
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