Study of FTIR Spectra and Thermal Analysis of Polyurethane
JIANG Zhi1 , YUAN Kai-jun1,LI Shu-fen1*,CHOW W K2
1. Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 2. Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Abstract：The thermal behavior of polyester-polyurethane and polyether-polyurethane in air atmosphere was investigated by using FTIR analysis in the temperature range from 20 to 400 ℃. The thermal degradation behaviors of polyester-polyurethane and polyether-polyurethane in different atmospheres were investigated by using thermogravimetry analysis(TG) in the temperature range from 20 to 700 ℃. The FTIR results together with the TG investigations showed that polyester-polyurethane has two degradation steps in air, but polyether-polyurethane has only one degradation step. The thermal analysis results also showed that the onset degradation temperature of polyether-polyurethane is lower than that of polyester-polyurethane, suggesting that the thermal stability of polyester-polyurethane is higher than polyether-polyurethane, and the onset degradation temperature of polyurethane in air is lower than that in nitrogen, suggesting that the presence of oxygen affects significantly the break of the polymeric chains.
[1] Duquesne S, Bras M L, Bourbigot S, et al. Polymer Degradation and Stability, 2001, 74: 493. [2] Branca C, Blasi C D, Casu A. Thermochimica Acta, 2003, 399: 127. [3] Yoshitake N, Furugawa M. Journal of Analytical and Applied Pyrolysis, 1995, 33: 269. [4] Dosanjh S S, Pagni P J, Fernandez-Pello A C. Combustion and Flame, 1987, 68: 131. [5] Esperanza M M, Garcia A N, Font R, et al. Journal of Analytical and Applied Pyrolysis, 1999, 52: 151. [6] Font R, Fullana A, Caballero J A, et al. Journal of Analytical and Applied Pyrolysis, 2001, 63: 58. [7] MA Shi-an，CHENG Shi-yuan，LI Jian-zong(马世安, 程时远, 李建宗). Journal of Hubei University(湖北大学学报), 1994, 16: 69. [8] Bilbao R, Mastral J F, Ceamanos J, et al. Journal of Analytical and Applied Pyrolysis, 1996, 37: 69. [9] WU Jin-guang(吴瑾光). The Modern Technique and Application of FTIR (Ⅰ) (近代傅里叶变换红外光谱技术及应用·上卷). Beijing: The Publishing Company of Science and Technology Documentation(北京: 科学技术文献出版社), 1994. [10] FANG Yu-sheng，ZHU Lü-min(方禹生, 朱吕民). Polyurethane foams(聚氨酯泡沫塑料). Beijing: Chemical Industry Press(北京: 化工出版社)，1994. [11] LIU Liang-bing(刘凉冰). Polyurethane Industry(聚氨酯工业)，2001, 16:2.
