UHMWPE／LLDPE／HBP共混体系流变行为研究

摘要

In order to improve the processing properties of ultra-high molecular weight polyethylene, blends of ultra-high molecular weight polyethylene/liner low density polyethylene/hyper-branched polyester-amide were prepared. The rheological behavior of UHMWPE/LLDPE/HBP blends was researched in this paper. The results indicated the apparent viscosity of the blends first deceases and then increases with increasing of HBP content. The blends are shear-thinning fluid and the non-Newtonian index less than 1. The viscous flow activation energy of the blends is lowest when the shear rate is 10 s~. The structural viscosity index of blends was decreased with the HBP content increased and increase with the viscosity average relative molecular weight of UHMWPE increased.%为改善超高相对分子质量聚乙烯（UHMWPE）的加工流变性，将超支化聚酯酰胺（HBP）和线性低密度聚乙烯（LLDPE）与UHMWPE共混，研究了不同比例UHMwPE／LLDPE／HBP共混体系的流变行为。结果表明：UHMWPE／LLDPE／HBP共混体系熔体表观粘度随HBP质量分数的增加而减小；共混体系非牛顿指数〈1，为典型的切力变稀流体；当剪切速率为10s。时，共混体系的粘流活化能较小；结构粘度指数随HBP质量分数增加而下降，随UHMWPE粘均相对分子质量增加而增大。