利用高级流变扩展系统仪(ARES)分别对碳酸钙(CaCO3)填充高密度聚乙烯(HDPE),碳酸钙填充高密度聚乙烯(HDPE)/超高摩尔质量聚乙烯(UHMWPE)复合材料的流变学行为进行了研究.结果表明,不同的加工条件下,CaCO3对HDPE流变行为基本没有影响,而对HDPE/UHMWPE复合体系影响明显.随着转矩流变仪剪切速率的提高,HDPE/UHMWPE/CaCO3三元复合体系融体黏弹性参数发生改变.其中低频储能模量(G′)、损耗模量(G″)和零切黏度(η0)逐渐升高,损耗因子(tanδ)逐渐降低,表明体系融体流变行为由liquid-like行为向solid-like 行为转变,融体分子链作用加强.加工条件的改变引起了融体结构的转变,从而导致等温结晶过程加快.熔体黏弹性转变与CaCO3刚性颗粒与UHMWPE颗粒之间的相互作用密切相关.%Rheological behavior of CaCO3 filled HDPE composites and CaCO3 filled HDPE/UHMWPE blends were investigated through an advanced rheology expanded system (ARES), respectively. The results showed that CaCO3 can not change the rheological behavior of HDPE, while HDPE/UHMWPE composites had obvious effects. With the increase of the screw speed of torque rheometer, the melt viscoelastic parameters of HDPE/UHSWPE/CaCO3 changed obviously. The low frequencystorage modulus, storage loss modulus and shear viscosity increased while the loss factor decreased which indicated that the melt rheological behavior changes from liquid-like behaviors to solid-like behaviors and the molecular chain effect enhanced. The change of process caused the change of structure of the blend melt, which caused the isothermal crystallization process accelerated. The viscoelastic transition of melt was related to the interaction of UHMWPE and CaCO3 rigid particle.
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