【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2.4×108个/cm3.更多还原

【Abstract】 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 properties and thermal stability of PS / Talc composites were investigated. Meanwhile,the key factors affecting cell structure 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 addition 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,respectively.更多还原