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首页> 外文期刊>Journal of Applied Polymer Science >Impact of microextrusion and addition of graphite nanoplatelets on bulk and surface mechanical properties of UHMWPE
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Impact of microextrusion and addition of graphite nanoplatelets on bulk and surface mechanical properties of UHMWPE

机译：微挤压和添加石墨纳米片对UHMWPE的体积和表面力学性能的影响

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摘要

A new processing route for producing ultra-high molecular weight polyethylene (UHMWPE) nanocomposite combining swelling in toluene, microextrusion, and compression-molding was developed. Using this novel method, extruded neat UHMWPE (e-PE), and extruded UHMWPE blended with 0.5 wt % of graphite nanoplatelets (e-PE/g) were processed. UHMWPE was also processed by compression-molding (PE) as reference material. Bulk mechanical behavior of the materials was evaluated by tensile, bending and impact tests, while surface mechanical behavior was assessed by scratch and sliding wear experiments. We found that e-PE/g has a brittle tensile behavior in comparison with the two other grades. Bending and impact toughness increase in this order: PE ≈ e-PE/g < e-PE. Scratch behavior of the materials is quite similar, e-PE has however the lowest friction coefficient, and hence, exhibits antifriction properties. The cumulative sliding energy increases in this order: e-PE ≈ PE < e-PE/g, indicating that e-PE/g may have a lower wear resistance as compared to the two other materials. The combination of extrusion with compression-molding caused the formation of well-consolidated meso-domains containing oriented chains. Such a new morphology is at the origin of the high tensile strength, high fracture toughness, and antifriction properties of e-PE that appears like a promising material for medical or machine construction applications. The addition of graphite nanoplatelets induces a poor consolidation that resulted from the segregation of the fillers between powder grains of UHMWPE. This explains the brittle tensile behavior and the high cumulative sliding energy of the UHMWPE nanocomposite.
机译：开发了一种新的生产工艺，该工艺结合了甲苯溶胀，微挤出和压模成型的超高分子量聚乙烯（UHMWPE）纳米复合材料。使用这种新方法，可以加工挤出的纯UHMWPE（e-PE），以及与0.5 wt％的石墨纳米片（e-PE / g）混合的挤出的UHMWPE。 UHMWPE还通过压缩成型（PE）作为参考材料进行处理。材料的整体机械性能通过拉伸，弯曲和冲击测试进行评估，而表面机械性能通过刮擦和滑动磨损实验进行评估。我们发现e-PE / g与其他两个等级相比具有脆性拉伸性能。弯曲和冲击韧性按以下顺序增加：PE≈e-PE / g

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