氰酸酯／双马来酰亚胺／环氧树脂三元共聚物及性能研究

Research of copolymer and properties of cyanate resin modified with bismaleimide resin and epoxy resin

采用双马来酰亚胺和环氧树脂与氰酸酯共聚对氰酸酯树脂进行改性，用FTIR跟踪了其固化过程。性能测试表明，当BCE：BMI：EP为5：2：3时，其固化物的冲击强度达到了12．2kJ·cm^-2，韧性有较大的提高；改性树脂的耐热性随着EP含量的增加而下降，当EP含量为30％时，Tg为233．7℃；改性后的氰酸酯树脂在1MHz频率下的介电常数和介电损耗角正切都比纯CE的有所增加，但上涨的幅度较小，仍具有优异的介电性能；DMA分析表明，在瓦温度时，损耗因子和损耗模量达到最大值，其中，tanδmax为0．359。

Coplymer of cyanate resin was investigated modified with bismaleimide resin and epoxy resin and the curing process of the system was detected by FTIR. Mechanical characterization revealed that the shock strength of BCE/BMI/EP can reach 12.2kJ/cm^2 when the composition was 5：2：3. Heat resistance decreased with EP content increasing, and Tg dropped down to 233.7℃ when the content of EP was 30%. The dielectric analysis resulted that dielectric constant and dielectric loss reduced a little. DMA test showed the loss factor and loss modulus reached to peak value at Tg, of which the tanδmax was 0.359.