In this study, a synthesized ultra-high molecular weight polyethylene (UHMWPE) with a less entangled state and a commercial UHMWPE with a highly entangled state were blended with high-density polyethylene (HDPE) by melt blending, respectively. Rheology, 2D small-angle X-ray scattering (2D-SAXS), differential scanning calorimetry (DSC), and tensile test were used to study the relationship between the microstructure and the mechanical properties of blends. It was demonstrated that the UHMWPE with the less entangled state was easy to be oriented at a given flow. More mechanical networks were achieved among the HDPE matrix and the UHMWPE chains due to the fewer entanglements of synthesized UHMWPE, improving the melting recovery of blends. Furthermore, notably oriented structures (shish-kebabs) with increased long-periods were made in the blends of weakly entangled UHMWPE and HDPE. The tensile strength of this blend was thus enhanced, i.e., the tensile strength raised for neat HDPE from 45.7 to 83.1 MPa for HDPE/UHMWPE blends containing 10 wt of less entangled UHMWPE. However, the phase separation of blends was characterized when more weakly entangled UHMWPE was incorporated. (C) 2017 Wiley Periodicals, Inc.
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机译：本研究采用熔融共混法，分别将合成的少纠结态超高分子量聚乙烯（UHMWPE）和高纠结态的商用超高分子量聚乙烯（UHMWPE）与高密度聚乙烯（HDPE）共混。采用流变学、二维小角X射线散射（2D-SAXS）、差示扫描量热法（DSC）和拉伸试验等方法研究了共混物的微观结构与力学性能的关系。结果表明，纠缠态较少的UHMWPE在给定的流动下很容易定向。由于合成的UHMWPE的纠缠较少，HDPE基体和UHMWPE链之间实现了更多的机械网络，从而提高了共混物的熔融回收率。此外，在弱纠缠的UHMWPE和HDPE的混合物中，产生了具有更长周期的显着定向结构（烤羊肉串）。因此，该共混物的拉伸强度得到了提高，即对于含有10 wt %较少纠缠的UHMWPE的HDPE/UHMWPE共混物，纯HDPE的拉伸强度从45.7 MPa提高到83.1 MPa。然而，当掺入更弱纠缠的UHMWPE时，共混物的相分离是表征的。（C） 2017 Wiley Periodicals， Inc.
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