聚醚型水性聚氨酯热分解动力学的研究  

Study on Kinetics of Thermal Degradation of Waterborne Polyether Polyurethane

作　　者：张春华[1] 赵靖敏[2] 陈保国[1] 

机构地区：[1]内蒙古民族大学化学化工学院,内蒙古通辽028000 [2]通辽职业学院高职教育研究所,内蒙古通辽028000

出　　处：《涂料工业》2012年第2期23-25,35,共4页Paint & Coatings Industry

摘　　要：以聚醚N-210为原料,利用丙酮法合成了水性聚氨酯,使用热重分析技术考察了聚醚型水性聚氨酯分别在氮气条件和氧气条件下的热稳定性,并采用"无模式法"研究了在不同气氛氛围下的热分解动力学,同时计算了不同热分解阶段反应的活化能Ea、指前因子A等动力学参数。结果表明:合成的聚醚型水性聚氨酯的热分解过程在氮气条件和氧气条件下均为二阶段过程,第一阶段为硬段链的分解,第二阶段为软段链的分解,同时氧气的存在促进了水性聚氨酯主链上C—C和C—O键的断裂。The title waterborne polyurethane was prepared from polyether N -210 by acetone process. The kinetics of thermal degradations of waterborne polyether polyurethane in air and nitrogen atmospheres were investigated by thermogravimetry analysis （TG）. The kinetic parameters of thermal degradation of waterborne polyurethanes, including activation energy and pre -exponential factors, were obtained with the ＂＇model free method＂. Tile ~sults showed that the thermal decomposition process could be divided into two steps. 3＂he first - stage was degradation of hard segment, and the second - stage was degradation of soft seg- ment. The presence of oxygen would affect significantly the break of the polymeric C--C and C--O bonds.

关 键 词：聚醚 水性聚氨酯 热分解 动力学 

分 类 号：TQ630.4[化学工程—精细化工]