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Processing, wear, and mechanical properties of polyethylene composites prepared with pristine and organosilane-treated carbon nanofibers.

机译：用原始和有机硅烷处理的碳纳米纤维制备的聚乙烯复合材料的加工，磨损和机械性能。

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摘要

Polymers and nanocomposites have been increasingly used for tribological applications over the last few decades. In particular, ultrahigh molecular weight polyethylene (UHMWPE) is a high performance polymer with excellent strength, toughness, and wear resistance. Because of these properties, UHMWPE is an ideal material for a variety of applications including body armor, components of sporting goods such as skies and snowboards, and liners in total joint replacement. Though the toughness and wear resistance far exceed that of most other polymeric materials, there is a high demand for improving the tribological and mechanical properties of UHMWPE for many applications. The approach used in this work for improving such properties is through nanocomposite technology, specifically via the incorporation of carbon nanofibers. In order to obtain the full potential of nanocomposite technology, two critical issues need to be addressed: appropriate interactions between the filler and matrix and proper dispersion of the nano-reinforcement. These critical issues are particularly important for UHMWPE nanocomposites in that UHMWPE is an extremely viscous polymer and thus cannot be processed conventionally, typically resulting in dispersion issues far worse than that of other composite systems. Furthermore, UHMWPE is non-polar, so interactions between filler and matrix will be limited to Van der Waals forces for untreated nanofillers. Therefore, the research presented aims at solving these issues by using a paraffin-assisted processing method and applying appropriate surface treatment to the carbon nanofibers. Under optimized processing conditions, wear and mechanical properties of UHMWPE composites can be substantially improved.
机译：在过去的几十年中，聚合物和纳米复合材料已越来越多地用于摩擦学领域。尤其是，超高分子量聚乙烯（UHMWPE）是一种具有出色强度，韧性和耐磨性的高性能聚合物。由于这些特性，UHMWPE是各种应用的理想材料，包括防弹衣，体育用品的组件（如天空和滑雪板）以及完全替换关节的衬里。尽管其韧性和耐磨性远远超过大多数其他聚合物材料，但对于许多应用而言，仍需要提高UHMWPE的摩擦学和机械性能。这项工作中用于改善此类性能的方法是通过纳米复合技术，特别是通过掺入碳纳米纤维。为了获得纳米复合材料技术的全部潜能，需要解决两个关键问题：填料与基质之间的适当相互作用以及纳米增强材料的适当分散。这些关键问题对于UHMWPE纳米复合材料尤为重要，因为UHMWPE是一种非常粘的聚合物，因此无法常规处理，通常导致的分散问题远比其他复合体系差。此外，UHMWPE是非极性的，因此对于未处理的纳米填料，填料与基质之间的相互作用将限于范德华力。因此，提出的研究旨在通过使用石蜡辅助处理方法并对碳纳米纤维进行适当的表面处理来解决这些问题。在优化的加工条件下，UHMWPE复合材料的磨损和机械性能可以得到显着改善。

著录项

  • 作者

    Wood, Weston.;

  • 作者单位

    Washington State University.;

  • 授予单位 Washington State University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 176 p.
  • 总页数 176
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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