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Bulk Oriented UHMWPE/FMWCNT Films for Tribological Applications

机译：适用于摩擦学应用的块状UHMWPE / FMWCNT薄膜

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Bulk oriented films based on ultrahigh molecular weight polyethylene (UHMWPE) with a drawing ratio of 35 were prepared by using a low solvent concentration. Bulk oriented films were filled with fluorinated multi-walled carbon nanotubes (FMWCNTs). The structure of bulk oriented films on UHMWPE, which were manufactured at different stages of orientation, was investigated by scanning electron microscope (SEM) and differential scanning calorimetry (DSC). The addition of FMWCNTs at a concentration of 0.05 wt % in bulk oriented UHMWPE films led to an increase in the tensile strength by 10% (up to 1020 ± 23 MPa) compared to unfilled oriented films. However, the addition of FMWCNTs at a concentration of more than 0.5 wt % led to a decrease in tensile strength due to excessive accumulation of nanotubes and hindering of self-diffusion of UHMWPE macromolecules. The multiple increase in tensile strength, doubling the hardness, the formation of fibrillar structure, and the presence of carbon nanotubes led to a significant increase in tribological properties in bulk oriented films. Bulk oriented UHMWPE/1% FMWCNT films can be operated at a maximum contact pressure that is 18 times higher and exhibit a specific wear rate more than an order of magnitude and less than the traditional UHMWPE of isotropic structure. Bulk oriented UHMWPE/1% FMWCNT films have an extremely low dry coefficient of friction (COF) of 0.075 at a contact pressure of 31 MPa. The developed bulk oriented films can be used for manufacturing frictional surfaces for sliding bearings, or for acetabular cups for knee and hip endoprostheses.
机译：通过使用低溶剂浓度制备基于拉伸比为35的超高分子量聚乙烯（UHMWPE）的体取向膜。体取向膜填充有氟化多壁碳纳米管（FMWCNT）。通过扫描电子显微镜（SEM）和差示扫描量热法（DSC）研究了在不同取向阶段制造的UHMWPE上的块状取向膜的结构。与未填充的取向膜相比，在本体取向的UHMWPE膜中以0.05 wt％的浓度添加FMWCNT导致抗张强度提高了10％（高达1020±23 MPa）。然而，由于纳米管的过量积累和UHMWPE大分子的自扩散的阻碍，以大于0.5wt％的浓度添加FMWCNT导致抗张强度降低。拉伸强度的倍增，硬度加倍，纤维状结构的形成以及碳纳米管的存在导致整体取向薄膜的摩擦学性能显着提高。体取向的UHMWPE / 1％FMWCNT膜可以在最大接触压力高18倍的条件下运行，其比磨损率比同质结构的传统UHMWPE高出一个数量级，并且比传统的UHMWPE还要小。体取向的UHMWPE / 1％FMWCNT膜在31 MPa的接触压力下具有0.075的极低的干摩擦系数（COF）。所开发的块状取向膜可用于制造滑动轴承的摩擦表面，或用于膝盖和髋关节假体的髋臼杯。

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