【摘要】 用红外光谱法研究了聚丁二烯聚氨酯在本体状态下的生成动力学。选用异氰酸酯在２２７０ｃｍ￣（－１）的吸收作为分析谱带，定量加入硫氰酸钾作内标。结果表明：生成反应为二级反应；没有扩链剂存在时，端羟基液体聚丁二烯与４，４＇—二苯基甲烷二异氰酸酯（ＭＤＩ）和２，４—甲苯二异氰酸酯（ＴＤＩ）反应的表现活化能分别为３４．６５ｋＪ／ｍｏｌ和４３．２２ｋＪ／ｍｏｌ；加入扩链剂１，４—丁二醇（ＢＤＯ）使ＭＤＪ体系活化能降至２１．１９ｋＪ／ｍｏｌ，ＴＤＩ体系活化能降至２５．７９ｋＪ／ｍｏｌ。更多还原

【Abstract】 ABSTRACT Polymerization kinetics of polybutadiene－based polyurethanes was investigated by IRmethod in solvent－free state. Such kinetic parameters as reaction order， rate constant andactivation energy were obtained．The addition of chain extender decreased the activation ener-gy of the reaction.An increase in rate constant was observed when the mole ratio of OH toNCO increased．The rate constant was also increased with temperature.Kev words Polyurethane，IR，Kinetics更多还原