Abstract The effect of migration of calcium carbonate (CaCO3) nanoparticles on the breakup dynamics of Ethylene-Propylene-Diene Monomer (EPDM) droplets in Polypropylene (PP) matrix during melt extrusion was investigated in situ. The breakup process of EPDM droplets was sped up dramatically when the migration of CaCO3 nano-particles from dispersed phase to matrix was introduced to PP/EPDM melts. It was found that both the total breakup time and the shape stability of slender EPDM droplets decreased with the increase of CaCO3 concentration. Both the maximum value in equivalent diameter d and aspect ratio AR of EPDM droplets were also reduced by increasing the composition of CaCO3 nanoparticles. Results were discussed in consideration of interfacial tension and migration of CaCO3 nanoparticles. Reduction in interfacial tension is mainly responsible for the improved breakup process in the two-step composites with CaCO3 nanoparticles (

中文翻译：

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通过挤出过程中纳米颗粒的迁移促进变形 EPDM 液滴的破碎

摘要 原位研究了碳酸钙 (CaCO3) 纳米颗粒的迁移对聚丙烯 (PP) 基质中三元乙丙 (EPDM) 液滴破碎动力学的影响。当 CaCO3 纳米粒子从分散相向基体的迁移被引入到 PP/EPDM 熔体中时，EPDM 液滴的破碎过程显着加速。发现细长EPDM液滴的总破碎时间和形状稳定性都随着CaCO3浓度的增加而降低。通过增加 CaCO3 纳米颗粒的组成，EPDM 液滴的等效直径 d 和纵横比 AR 的最大值也降低了。考虑到 CaCO3 纳米粒子的界面张力和迁移，对结果进行了讨论。