Melt processing is challenging for recycling of mineral-filled polypropylene (PP) composites because the melt flow system, the viscoelasticity and the appearance of the extrudate profile change due to a combination of extensive shear forces and thermal-oxidative degradation. The flow pattern and the swelling behaviour of polypropylene-co-ethylene-kaolin (PP-co-E-kaolin) composite with 20% (by wt) kaolin and 5% (by wt) maleic anhydride-graft-polypropylene (PP-g-Ma) were distinguished using a single-screw extruder operated at different die temperatures and extrusion cycles. The compound was prepared by mixing the ingredients using a heated two-roll mill, whereas the composite rheological and die swell measurements were obtained from the single-screw extruder. Confirmation of the obtained flow behaviour was evaluated using an Ubbelhode viscometer and a melt flow index (MFI) tester. The apparent viscosity (η_app) of molten composites and the swelling ratio (B) of extrudates decreased with increasing the extrusion temperature, reflecting the PP melt strength weakened with increasing the amount of viscous component. At the same time, increasing MFI values also indicate the production of lower molecular weight PP-co-E composites. This was caused by the backbone chain-scission reaction due to the thermal-oxidative degradation in the PP-co-E matrix. Meanwhile, in the case of multiple extrusion cycles, a gradual increase in the composite molar mass (M_v) and B justified the development of chemical crosslinking in the PP-co-E-kaolin composite extrudates.

熔体加工对于矿物填充聚丙烯 (PP) 复合材料的回收利用具有挑战性，因为熔体流动系统、粘弹性和挤出物轮廓的外观由于广泛的剪切力和热氧化降解的组合而发生变化。流型和聚丙烯-的溶胀行为共-亚乙基-高岭土（PP-共-E-高岭土）与20％的复合材料（按重量计）高岭土和5％（按重量）马来酐接枝-聚（PP-克-Ma) 使用在不同模具温度和挤出周期下运行的单螺杆挤出机进行区分。该复合物是通过使用加热的双辊磨机混合成分来制备的，而复合流变学和模头膨胀测量值是从单螺杆挤出机中获得的。使用 Ubbelhode 粘度计和熔体流动指数 (MFI) 测试仪评估获得的流动行为的确认。熔融复合材料的表观粘度（η _app）和挤出物的溶胀比（B）随着挤出温度的升高而降低，反映了聚丙烯熔体强度随着粘性组分用量的增加而减弱。同时，增加 MFI 值也表明产生了较低分子量的 PP- co-E 复合材料。这是由 PP- co- E 基质中的热氧化降解引起的主链断裂反应引起的。同时，在多次挤出循环的情况下，复合摩尔质量 ( M _v ) 和B的逐渐增加证明了 PP - co -E-高岭土复合挤出物中化学交联的发展。