二烯丙基双酚A对低黏度氰酸酯树脂的改性研究

为改善低黏度氰酸酯树脂基体的综合性能,研究了二烯丙基双酚A(DBA)对其的改性作用。通过粘温试验、DSC、力学试验、TGA、DMA、吸水率和介电测试等分析手段对DBA改性前后的树脂进行性能表征。结果表明:改性后树脂的粘度仍然满足直接热熔法的工艺性要求;DBA对氰酸酯树脂具有显著的催化作用,可以提高转化率;加入适量的DBA对氰酸酯树脂有一定的增韧作用,其中10%DBA的树脂冲击强度和弯曲韧性分别是未加DBA树脂的179%和165%;加入DBA后树脂基体的耐热性能、耐湿热性能和介电性能均有降低,但含量较少时仍满足应用要求。综合试验结果,当DBA含量为5%~10%时,树脂综合性能较好。

STUDY ON THE MODIFICATION OF DIALLYL BISPHENOL A TO CYANATE ESTER RESIN WITH LOW VISCOSITY

The modification of dimly lbisphenol A (DBA) to low viscosity cyanate ester resin was investigated by the test of viscosity-temperature characteristics,differential scanning calorimetry,mechanical test,thermal gravimetric analysis,dynamic thermomechanical analysis,water absorption and dielectric performance.The results show that the viscosity of CE modified by DBA slightly increased,but it still satisfied the viscosity requirement for hot melt method.DBA can catalyze the curing reaction of CE and increase the conversion ratio.DBA of appropriate amount can toughen the cured resin,the impact strength and flexural toughness of the resin with 10％ DBA were 179％ and 165％ times higher than those of the unmodified resin,respectively.The heat resistance,moisture resistance and dielectric property of CE modified by DBA all decreased slightly compared with the unmodified,but still met the application requirements.It is concluded that the optimum addition of DBA is 5％ ～ 10％.