【摘要】 用傅里叶变换红外光谱(FT-IR)研究了氰酸酯单体的等温固化反应。获得了有机锡催化氰酸酯和苯乙烯体系在不同固化温度下的转化率和动力学参数。氰酸酯的转化率随着温度的升高和催化剂的使用而提高。不含催化剂时苯乙烯对氰酸酯的影响较小,而有机锡和苯乙烯同时存在时对氰酸酯有很强的催化作用。在所有的体系中,催化反应速率常数对氰酸酯单体浓度在动力学控制阶段表现为一级反应。改性体系的冲击强度和弯曲强度比未改性氰酸酯最高分别提高了45．3%和18．7%。更多还原

【Abstract】 The isothermal cure of a dicyanate ester monomer by Fourier transform infrared spectroscopy (FT- IR) has been investigated.The degree of cyanate conversion and the kinetic parameters have been determined for organic tin catalyzed cyanate and styrene systems at different curing temperatures.The cyanate conversion increases with the increment of curing temperature and with the addition of catalyst.Styrene has a little effect on cyanate in the absence of catalyst,but styrene is very catalytic for eyanate when in presence of organic-tin catalyst.In all the systems studied,the rate of reaction showed a first-order dependence on the cyanate concentration in the kinetically controlled stage.The impact strength and flexural strength of modified cyanate systems increased by 45.3% and 18.7% than unmodified cyanate ester resin,respectively.更多还原