Exploring the entangled state and molecular weight of UHMWPE on the microstructure and mechanical properties of HDPE/UHMWPE blends,Journal of Applied Polymer Science

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Exploring the entangled state and molecular weight of UHMWPE on the microstructure and mechanical properties of HDPE/UHMWPE blends
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-03-18 , DOI: 10.1002/app.50741
Gan Tao ₁ , Yuming Chen _{1,

2} , Jingshan Mu ₁ , Letian Zhang ₃ , Chunlin Ye ₃ , Wei Li _{1,

2}

Affiliation

Three types of ultra‐high molecular weight polyethylene (UHMWPE) with different entangled state and molecular weight were blended with high‐density polyethylene (HDPE) matrix by melt blending. Rheology, 2D‐SAXS, 2D‐WAXD, DSC, and mechanical tests were used to study the evolution and difference of microstructure and mechanical properties of the blends. The addition of weakly entangled UHMWPE enhanced the chain diffusion and chain orientation ability under a specific flow field. Thus, the rheological properties and mechanical properties of the blends were improved with the mix of weakly entangled UHMWPE. The mechanical properties enhancement effect of HDPE/UHMWPE blends with weakly entangled UHMWPE was owing to the shish‐kebab structure formed in the injection molding process. The molecular chains of UHMWPE with a low degree of entanglement and high molecular weight increased the lamella size and crystallinity of the blends during processing. This leads to the formation of more oriented shish structures and more kebab lamella. Besides, the molecular chains of weakly entangled UHMWPE were better interlocked and intertwined with other polyethylene chains in the amorphous region, acting as the tie molecules, significantly improving the impact resistance.

中文翻译：

探索UHMWPE的纠缠态和分子量对HDPE / UHMWPE共混物的微观结构和力学性能的影响

通过熔融共混将三种类型的纠缠态和分子量不同的超高分子量聚乙烯（UHMWPE）与高密度聚乙烯（HDPE）基体进行共混。使用流变学，2D-SAXS，2D-WAXD，DSC和力学测试来研究共混物的微观结构和力学性能的演变和差异。在特定流场下，弱缠结的UHMWPE的加入增强了链的扩散和链的定向能力。因此，掺入弱缠结的UHMWPE可改善共混物的流变性能和机械性能。HDPE / UHMWPE与弱缠结的UHMWPE共混物的机械性能增强效果是由于在注塑过程中形成了烤肉串结构。低缠结度和高分子量的UHMWPE分子链在加工过程中增加了共混物的薄片尺寸和结晶度。这导致形成更多定向的烤肉结构和更多烤肉串薄片。此外，弱缠结的UHMWPE的分子链与无定形区域中的其他聚乙烯链更好地互锁和缠结，起到了连接分子的作用，从而显着提高了抗冲击性。

更新日期：2021-05-11

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