中文摘要：

利用混合效果优异的平行三螺杆挤出机制备了聚苯乙烯／活性滑石粉（ PS／Talc ）复合材料，分析了Talc在PS基体中的分散性，研究了复合材料的力学性能和热稳定性，并通过挤出发泡正交试验，探讨影响泡孔结构的主次因素．研究结果表明，三螺杆挤出混炼能很好地改善Talc在基体中的分散效果，当Talc含量在6％以下时，能够均匀分散在PS基体中；拉伸强度、冲击强度以及断裂伸长率随着Talc含量增加呈现先增加后减小的趋势，当Talc含量为6％时，拉伸强度、冲击强度以及断裂伸长率出现极大值；随着Talc含量增加，弯曲强度下降，弯曲模量增加；Talc能够增加复合材料的热稳定性，当Talc的填充量为10％时，复合材料的热稳定最好；挤出发泡正交实验结果表明，影响PS／Talc复合材料发泡行为的主次因素为：Talc含量、口模压力、口模温度；当Talc填充量为8％时，得到的泡孔尺寸最小，泡孔密度最大，它们分别为12．4μm和2．4＆#215;108个／cm3．

英文摘要：

Polystyrene/active Talc （ PS/Talc） composites were prepared by means of a parallel triple-screw extruder with excellent mixing ability .Then, the dispersion of Talc in PS matrix was analyzed , and the mechanical proper-ties and thermal stability of PS/Talc composites were investigated .Meanwhile , the key factors affecting cell struc-ture were discussed via extrusion foaming orthogonal experiments .The results show that （1） the dispersion of Talc in PS matrix is improved by the triple screw extruder , and Talc can be dispersed in PS matrix evenly when the Talc content is below 6%;（2） the tensile strength, the impact strength and the elongation at break first increase and then decrease as the Talc content reduces , and they all reach the maximum when the Talc content is 6%;（3） with the increase of the Talc content , the flexural strength decreases while the flexural modulus increases;（4） the addi-tion of Talc can enhance the thermal stability of PS/Talc composites , and the thermal stability reaches the maximum at the Talc content of 10%;（5） the primary factor affecting the foaming behavior of PS /Talc composites is the Talc content , which is followed by the die pressure and the die temperature;and （6） when the Talc content is 8%, the minimum cell size and the maximum cell density are obtained , which are 12.4μm and 2.4×108 cells/cm3 , re-spectively .