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Effects of Polymer Molecular Weight and Filler Particle Size on Flow Behavior of Wood Polymer Composites

机译：聚合物分子量和填料粒径对木质聚合物复合材料流动行为的影响

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摘要

The influence of polymer matrix molecular weight and filler particle size on rheological properties and extru-date distortions of metallocene polyethylene (mPE)/ wood flour (WF) composites has been investigated by rotational and capillary rheometers. It was found that at low shear rates smaller filler particles provide higher shear viscosity than the larger sized filler. At high shear rates and WF loadings above 30 wt%, the effect of particle size on the melt flow properties becomes negligible. The relative increase of the storage modulus with decreasing particle size is more pronounced in the case of low molecular weight polymer matrix than that in higher molecular weight polyethylene based composites. The wood filled polyethylenes exhibit extrudate surface defects, which are complex function of the shear rate, polymer matrix molecular weight, and filler particle size. Increasing the shear rate results in pressure oscillations and spurt-flow. It was also observed that the evolution of the extrudate surface tearing is strongly dependent on the pressure during a single pressure oscillation cycle in the spurt flow regime.
机译：通过旋转流变仪和毛细管流变仪研究了聚合物基体分子量和填料粒径对金属茂聚乙烯（mPE）/木粉（WF）复合材料的流变性能和挤出变形的影响。发现在低剪切速率下，较小的填料颗粒比较大尺寸的填料提供更高的剪切粘度。在高剪切速率和高于30 wt％的WF载荷下，粒度对熔体流动性能的影响变得可以忽略。在低分子量聚合物基体的情况下，储能模量随粒度减小的相对增加比在较高分子量的聚乙烯基复合物中的储能模量的相对增加更为明显。木材填充的聚乙烯表现出挤出物表面缺陷，这是剪切速率，聚合物基质分子量和填料粒径的复杂函数。增大剪切速率会导致压力振荡和喷流。还观察到，在喷流状态下，在单个压力振荡循环中，挤出物表面撕裂的发展强烈取决于压力。

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