1. Textile and Garment Industry of Research Institute Zhongyuan University of Technology Zhengzhou 450007 P. R. China
2. International Joint Laboratory of New Textile Materials and Textiles of Henan Province Zhongyuan University of Technology Zhengzhou 450007 P. R. China
3. School of Materials Science and Engineering Henan University of Technology Zhengzhou 450007 P. R. China
4. Faculty of Textile Science and Technology Shinshu University 3‐15‐1 Tokida Ueda 386‐8567 Japan