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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructure and properties of composite materials based on UHMWPE after mechanical activation
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Microstructure and properties of composite materials based on UHMWPE after mechanical activation

机译：机械活化后基于UHMWPE的复合材料的组织和性能

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In this work microstructure and mechanical properties of UHMWPE composites filled with Al_2O_3 nano-particles and microspheres after mechanical activation were studied. Ultra-fine particles of filler are distributed along the boundaries of UHMWPE "grains" and the filling level above 3 wt.% leads to forming of a solid layer on the surface of polymer particles, which leads to difficulty in self-diffusion of UHMWPE mac-romolecules during compaction and, consequently, the change of fracture mechanism. Shock-shear forces during mechanical activation lead to the formation of a metastable monoclinic phase from orthorhombic, breaking chemical bonds. According to proposed model mechanical activation leads to the formation of low molecular weight polymer chains which help to increase the rate of interdiffusion between the borders of the polymer particles and lead to better sintering of UHMWPE particles and higher mechanical properties.
机译：在这项工作中，研究了机械活化后填充有Al_2O_3纳米颗粒和微球的UHMWPE复合材料的微观结构和力学性能。填料的超细颗粒沿着UHMWPE“晶粒”的边界分布，并且填充量超过3 wt。％会导致在聚合物颗粒表面上形成固体层，从而导致UHMWPE mac难以自扩散分子在压实过程中发生断裂，从而改变断裂机理。机械活化过程中的冲击剪切力会导致由正交晶形成的亚稳单斜晶相，从而破坏化学键。根据提出的模型，机械活化导致低分子量聚合物链的形成，这有助于增加聚合物颗粒的边界之间的相互扩散的速率，并导致UHMWPE颗粒的更好的烧结和更高的机械性能。

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