采用在材料熔融挤出共混过程中提高双螺杆挤出机螺杆转速的方法,研究了较高螺杆转速条件下双螺杆挤出机的高剪切应力对PS/SEBS/CaCO3共混材料力学性能的影响.结果表明,双螺杆挤出机的高剪切应力可促进SEBS橡胶颗粒和碳酸钙颗粒聚集体的分散、引发聚苯乙烯(PS)、SEBS分子链的断链反应、形成大分子自由基、产生原位增容作用,并引起共混材料力学性能的明显改善.在220℃的挤出温度下,当螺杆转速由120 r/min提高至960 r/min时,其Ps/SEBS/CaCO3共混材料的缺口冲击强度将由5.7KJ/m2提高至11.0 kJ/m2,同时共混材料的拉伸强度和弯曲强度也获得一定的增加.双螺杆挤出机的熔融挤出温度对PS/SEBS/CaCO3共混材料力学性能的影响存在最佳值.
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