聚苯硫醚/纳米Si3N4复合材料的制备及性能研究

表面改性处理的纳米Si3N4粉体与聚苯硫醚（PPS）熔融共混挤出制成PPS/纳米Si3N4复合材料，通过拉伸、冲击实验及动态力学性能测试考察了纳米粉体加入量对复合体系各项性能的影响。结果表明，纳米Si3N4填充PPS基复合材料的力学性能明显优于纯PPS。随粉体添加量的增加，复合材料的拉伸强度增大，当添加量为0.8 %时，拉伸强度提高了22 %。随粉体添加量的增加,复合体系冲击强度增大，当粉体添加量为1.2 %时，冲击强度和缺口冲击强度出现最大值，分别比纯PPS增加了33 %和41 %。动态力学性能测试表明，随粉体添加量的增加，PPS分子链段松弛所需能量增加，松弛过程增长，体系储能模量降低，损耗模量增加。

Preparation and Properties of PPS/Nano-Si3N4 Composites

PPS/nano-Si3N4 composites were prepared via melt blending. The tensile and impact properties were significantly enhanced by filling nano-Si3N4.With the addition of 0.8 wt% Si3N4, the tensile strength of the composite was increased by 22 % based on neat PPS. As the content of Si3N4 increased, both un-notched and notched impact strengths each exhibited a maximum at 1.2 wt%, was increased by 33 % and 41 %, respectively, based on neat ones. As Si3N4 powder increased the activation energy of PPS segment relaxation, the storage modulus of PPS/nano-Si3N4 composites reduced, loss modulus increased.