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采用非等温差示扫描量热法对氰酸酯/联苯型环氧树脂共混体系的固化反应动力学、特征温度、转化率和玻璃化转变温度(Tg)进行了研究。共混体系的表观活化能随着联苯型环氧树脂量的增加而降低,质量比为80/20树脂体系的表观活化能为88.6k J·mol~(-1),高于80/20氰酸酯/双酚A型环氧树脂体系的表观活化能。当固化程度接近完全时,80/20共混体系的Tg为249.2℃,比80/20氰酸酯/双酚A型环氧树脂体系的Tg值高出24.3℃。催化剂的加入能使共混体系的表观活化能下降约20k J·mol~(-1),反应特征温度降低约100℃,同时对Tg影响较小。
The kinetics of curing reaction, characteristic temperature, conversion rate and glass transition temperature (Tg) of cyanate / biphenyl epoxy resin blends were investigated by non-isothermal differential scanning calorimetry. The apparent activation energy of the blends decreases with the increase of the amount of biphenyl epoxy resin. The apparent activation energy of the 80/20 resin system is 88.6k J · mol -1, / 20 cyanate ester / bisphenol A epoxy resin system of the apparent activation energy. When the degree of cure is nearly complete, the Tg of the 80/20 blend system is 249.2 ° C, which is 24.3 ° C above the Tg of the 80/20 cyanate / bisphenol A epoxy resin system. The addition of catalyst can decrease the apparent activation energy of the blend system by about 20k J · mol -1 and the characteristic temperature of the reaction decreases by about 100 ℃ with little effect on the Tg.