石英/双酚E型氰酸酯复合材料的制备与性能

Preparation and properties of quartz fiber/bisphenol- E isocyanate ester composites

采用实验方法研究双酚E型氰酸酯树脂的黏度和固化特性,揭示催化剂对双酚E型氰酸酯树脂固化特性的影响规律;采用树脂传递模塑和真空导入模塑工艺制备石英纤维/双酚E型氰酸酯复合材料,并考察其力学性能。结果表明,双酚E型氰酸酯树脂室温至90℃范围内的黏度小于300 m Pa·s,凝胶时间大于10 h,起始固化温度、固化温度和终止固化温度分别为186±5℃,235±5℃和286±5℃;固化特征温度随着催化剂含量的增加而降低,直至催化剂饱和,其饱和范围为0.02%~0.03%,可使双酚E型氰酸酯树脂体系的固化温度降低约60℃,从而避免爆聚,实现液相法成型其复合材料;真空导入模塑工艺制备的石英纤维/双酚E型氰酸酯复合材料的力学性能明显优于树脂传递模塑制备试样。

The viscosity and curing characteristics of bisphenol- E cyanate ester resin were studied through experiments to reveal the influence of catalyst on the curing mechanism of the cyanate ester resin. Quartz fiber / bisphenol- E cyanate ester composites were fabricated by RTM（ Resin Transfer Molding） and VIMP（ Vacuum Infusion Molding Process） processes to investigate its mechanical properties. Results show that the viscosity of the resin system is less than 300 m Pa·s and its gel time is more than 10 h from room temperature to 90 ℃. The temperatures of initial curing,curing and final curing of the resin system are 186 ± 5 ℃,235 ± 5 ℃ and 286 ± 5 ℃ respectively. And the curing characteristic temperature decreases with the increasing content of the catalyst until the catalyst saturates with the range from 0. 02% to 0. 03%,which can cause the curing temperature of the resin system decreased by nearly 60 ℃. Therefore,it is very important to avoid implosion and to fabricate the quartz fiber /cyanate ester composites by liquid composite molding successfully. The mechanical properties of VIMP manufactured sample is obviously higher than that of RTM fabricated sample.