氰酸酯/聚苯醚/超支化聚硅氧烷接枝纳米SiO_2复合材料的性能

Properties of CE/PPO/Hyperbranched Polysiloxane Grafting-SiO_2 Composites

以介电性能优异的聚苯醚(PPO)改性的双酚A型氰酸酯树脂(CE)为基体,分别以超支化聚硅氧烷接枝的纳米二氧化硅(HBP-SiO2)和未处理的纳米二氧化硅(nano-SiO2)为改性剂,制备了CE/PPO/HBP-SiO2和CE/PPO/nano-SiO2两种三元体系复合材料,并利用傅里叶变换红外光谱仪、差示扫描量热仪等分析手段对HBP-SiO2及复合材料的结构与性能进行了研究,结果表明,nano-SiO2的加入有助于提高改性体系的力学性能,且HBP-SiO2比nanoSiO2显示出更好的改性效果;CE/PPO/HBP-SiO2体系的介电常数均低于CE/PPO/nano-SiO2、CE/PPO、CE体系,而介电损耗因子比CE、CE/PPO体系的小,比CE/PPO/nano-SiO2体系的大。

Composites of CE/PPO/HBP-SiO2 and CE/PPO/nano-SiO2 were prepared using CE modified by PPO as a matrix, and HBP-SiO2 and nano-SiO2 as fillers. Infrared spectroscopy confirmed that hyperbranched polysiloxane was grafted onto SiO2 surface. Differential scanning calorimetry showed that HBP-SiO2 and nano-SiO2 had catalytic effect on CE/PPO system, and could reduce the curing temperature. The addition of SiO2 improved the mechanical properties of system, and the addition of HBP-SiO2 showed a better effect than nano-SiO2. The dielectric constant of CE/PPO/HBP-SiO2 composite was less than that of CE, CE/PPO, CE/PPO/nano- SiO2, and the dielectric loss factor was smaller than that of CE and CE/PPO, while higher than that of CE/PPO/nano-SiO2.