Study on Effect of Thermal Process on the Morphology and Mechanical Properties of RIM PUU by In-situ FTIR
LI Zai-feng1，ZHANG Tian-lin2，XU Chun-ming3
1. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China 2. Department of Chemical Engineering, Huaihai Institute of Industry and Technology, Lian Yuangang 222000, China 3. State Key Lab of Heavy Oil, University of Petroleum, Beijing 102249, China
Abstract：The samples of PUU polymers were characterized by In-situ FTIR in a temperature-controlled cell. The spectra of FTIR showed that the absorbance of ordered hydrogen-bonded urea carbonyl group(1 643 cm-1) became stronger with increasing thermal process time (at 100 ℃), then changed little after a certain time. The rate of change for absorbance of ordered hydrogen-bonded urea link, attributed to microphase separation kinetics, was enhanced with increasing thermal process temperature. In carbonyl region of FTIR spectra, absorbance for various carbonyls available in PUU polymers, associated with micro-hard domain, was observed before thermal process. However, after the process, only the absorbance of free urethane, hydrogen-bonded urethane and ordered urea became obvious. At 100 ℃, the longer the process time (beyond 8 h), the worse the mechanical properties obtained. The PUU polymers processed at 100 ℃ with the identical process time exhibited the best mechanical properties.
李再峰1，张田林2*，徐春明3 . FTIR研究热处理对RIM PUU的形态及力学性能的影响 [J]. 光谱学与光谱分析, 2004, 24(09): 1066-1068.
LI Zai-feng1，ZHANG Tian-lin2，XU Chun-ming3 . Study on Effect of Thermal Process on the Morphology and Mechanical Properties of RIM PUU by In-situ FTIR . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(09): 1066-1068.
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