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采用毛细管流变仪测试云母微粒/聚丙烯(PP)共混熔体的流变性能,用热重分析仪研究云母微粒对PP热稳定性能的影响。结果表明:云母微粒/PP共混熔体属于非牛顿假塑性流体,其表规粘度随剪切速率的增大而减小;随着云母微粒含量的增加,熔体的流动性能基本呈下降趋势,但当云母质量分数为4%时,熔体的粘度接近于纯PP:温度升高使得熔体表观粘度降低,非牛顿指数增加:在相同剪切速率下,云母含量的增加对其混熔体粘流活化能的影响不大;添加云母微粒后可以显著提高PP的热稳定性能。
The rheological properties of mica / polypropylene (PP) blends were tested by capillary rheometer. The effects of mica particles on the thermal stability of PP were studied by thermogravimetric analyzer. The results show that the mica / PP blend melt belongs to non-Newtonian pseudo-plastic fluid, and its apparent viscosity decreases with the increase of shear rate. With the increase of mica content, the melt flowability decreases , But when the mica mass fraction is 4%, the viscosity of the melt is close to that of the pure PP: the apparent viscosity of the melt decreases and the non-Newtonian index increases: at the same shear rate, the mica content increases The influence of activation energy of melt viscidity is not obvious. The addition of mica particles can significantly improve the thermal stability of PP.