环氧及酚醛树脂增韧改性氰酸酯树脂研究

STUDY ON CYANATE ESTER RESIN MODIFIED BY EPOXY RESIN AND PHENOLIC RESIN

用环氧树脂(EP)及酚醛树脂(PF)对氰酸酯树脂(CE)进行增韧改性,对改性CE的凝胶时间和DSC曲线进行研究并确定了改性CE的固化工艺。红外光谱分析表明改性CE固化时形成了柔韧性结构。研究了改性CE的力学性能、热性能、电性能及微观形态,发现EP的加入可增加CE的柔韧性,PF的加入可使CE的热稳定性损失减小。当CE/EP/PF的质量比为70/15/15时改性CE的弯曲强度和冲击强度分别从改性前的123.6 MPa、5.2 kJ/m2提高到134.5 MPa、16.7 kJ/m2,耐热性及电性能改变不大。

Cyanate ester （CE） resin was modified by epoxy resin（EP） and phenolic resin（PF） to improve its toughness and flexible. The gel time curves and differential scanning calorimetry （DSC） curve of modified CE resin were characterized and curing parameters were determined. The Fourier transform infrared （FI＇IR） analysis showed that flexible structure was formed in cured modified CE resin. The mechanical properties, thermal behavior, dielectric properties and morphologies of modified CE resin were investigated. The result showed that an increase in content of epoxy resin resulted in increased flexible of CE resin and an increase in content of PF decreased the thermal stability loss of CE resin. The excellent modified CE resin was prepared when CE/EP/PF was 70/15/15（ wt）, its flexural strength and impact strength increased from 123.6 MPa and 5.2 kJ/m^2 to 134.5 MPa and 16.7 kJ/m^2 respectively, and the thermal stability and dielectric properties of the modified CE varied little.