摘要
用红外分光光度计研究了端羟基聚丁二烯(HTPB)与液化改性4,4′-二苯基甲烷二异氰酸酯(LMDI)的反应动力学,计算了相应体系的反应活化能。通过红外光谱研究了60℃时HTPB与LMDI本体聚合反应形成聚氨酯的浓度-时间依赖行为,研究发现,随时间的增加,反应物的浓度呈指数下降,而浓度的倒数-时间则呈直线的关系。结果表明,NCO与OH的反应遵循二级反应动力学,反应活化能Ea=54.3kJ/mol。
A kinetic study of the reaction between a hydroxyl-terminated polybutadiene (HTPB) and liquefaction modified 4,4′-methylenebis(phenyl isocyanate) (LMDI) was carried out in the bulk state by using FT-IR spectroscopy. The FT-IR figure demonstrates the time-dependent behavior of concentrations of the two reactants in the course of the thermal polyurethane formation reaction of the HTPB and LMDI in bulk at 60 ℃. This graph exhibits an exponential decay for the starting substances HTPB and LMDI. The reciprocal concentration versus time plot shows a straight line for the polyurethane formation. The cure reaction of HTPB with diisocyanate is shown to obey a second-order rate law, being first order in both the HTPB and LMDI. The activation parameter obtained from the evaluation of kinetic data is E_a=(54.3) kJ/mol.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2004年第6期84-86,共3页
Polymer Materials Science & Engineering
