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研究了超支化聚(酯酰胺)(简称PF2)改善超高分子量聚乙烯(简称UHMW-PE)加工流动性的作用机理。采用扫描电镜(SEM)和X射线光电子能谱(XPS)分析PF2在共混物中的分布。结果显示PF2在共混物表面的含量高于内部。表明在剪切作用下,PF2易于在共混物表面富集,破坏受剪切面上UHMW-PE分子的链缠结并起到分子链间的滑动轴承作用,从而降低体系的表观粘度。PF2可改善UHMW-PE分子间的结合力。
The mechanism of improving the fluidity of ultra-high molecular weight polyethylene (UHMW-PE) by hyperbranched poly (ester amide) (PF2) was studied. The distribution of PF2 in the blends was analyzed by SEM and XPS. The results showed that the content of PF2 on the surface of the blend was higher than that on the interior. It shows that PF2 can be easily enriched on the surface of the blends under shear stress, which can destroy the chain entanglement of UHMW-PE molecules on the shear surface and act as a sliding bearing between the molecular chains to reduce the apparent viscosity of the blends. PF2 improves the binding between UHMW-PE molecules.