1. Fu Mingyuan, Sun Hanjing, Polyurethane Elastomer and its Application, Press of Chemical Industry, Beijing, 1994, p. 1 (in Chinese).
2. Shan Xi Institute of Chemical and Engineering. Handbook of Polyurethane Elastomer, Press of Chemical Industry, Beijing, 2001, p. 136 (in Chinese).
3. L. Irusta, M. Fernandez-Berridai, Polym. Degr. Stab., 63 (1999) 113.
4. L. Irusta, M. Fernandez-Berridai, Polymer, 40 (1999) 4821.
5. Lei Yan, Wu Feng, Lu Dan et al., Practical Handbook of Chemical and Engineering Materials, Guang Dong Press of Science and Technology, Guang Zhou, 1995, p. 74 (in Chinese).