增韧导热氰酸酯树脂基复合材料的制备及其性能

Preparation and Properties of the Cyanate Ester Composites with High Thermal Conductivity and Toughness

采用种子乳液聚合方法制备了聚丙烯酸丁酯/聚(甲基丙烯酸甲酯-co-丙烯酰胺)(poly(BA)/poly(MMA-coAM)),简称PBMAM核/壳结构共聚物;采用水热法对六方氮化硼(h-BN)进行表面改性,简称ABN;随后采用熔融共混法将PBMAM和ABN与氰酸酯树脂(CE)制得CE/PBMAM/ABN复合材料,研究了ABN用量对增韧氰酸酯复合材料性能的影响。结果表明,随着ABN含量的增加,复合材料的导热、热稳定性和力学性能均有提高。当PBMAM添加量为5%,ABN为8%时,复合材料的导热系数为纯树脂的2.4倍,冲击强度和弯曲强度比纯氰酸酯树脂的分别提高了2.8倍和1.7倍,复合材料的10%热分解温度提高了50℃。

The core-shell structured polymer,poly(butyl acrylate)/poly(methyl methacrylate-co-acrylamide),named as PBMAM was prepared by seed emulsion polymerization.Hexa-boron nitride(h-BN)was modified on the surfaces by hydrothermal method,i.e.,ABN.Then,the cyanate ester(CE)was melt-mixed with PBMAM and ABN to form CE/PBMAM/ABN composites.The effects of ABN content on the thermal conductivity and the mechanical properties of the toughened cyanate esters were discussed.The morphologies of the core-shell structure of the PBMAM toughener and the composites were characterized by transmission electron microscopy(TEM)and scanning electronic microscopy(SEM).The results show that the thermal conductivity of the CE/PBMAM/ABN composites is increased 2.4 times compared with that of pure CE resin,meanwhile the unnotched impact strength and the bending strength are increased 2.8 and 1.7 times,respectively,when the contents of the ABN and the PBMAM toughener are 8%and 5%,respectively.Meanwhile,the thermal decomposition temperature at 10%mass loss is increased by 50℃compared with the pure CE matrix.