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Preparation and investigation of tribological properties of ultra-high molecular weight polyethylene (UHMWPE)/graphene oxide

Bahrami, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/pat.3779
  3. Publisher: John Wiley and Sons Ltd
  4. Abstract:
  5. This article has been devoted to investigation of the tribological properties of ultra-high molecular polyethylene/graphene oxide nanocomposite. The nanocomposite of ultra-high molecular polyethylene/graphene oxide was prepared with 0.5, 1.5, and 2.5 wt% of graphene oxide and with a molecular weight of 3.7 × 106 by in-situ polymerization using Ziegler–Natta catalyst. In this method, graphene oxide was used along with magnesium ethoxide as a novel bi-support of the Ziegler–Natta catalyst. Analyzing the pin-on-disk test, the tribological properties of the nanocomposite, such as wear rate and mean friction coefficient, were investigated under the mentioned contents of graphene oxide. The results showed that an increase in graphene oxide content causes a reduction in both wear rate and mean coefficient friction. For instance, by adding only 5 wt% graphene oxide to the polymeric matrix, the wear rate and mean coefficient friction decreased about 34% and 3.8%, respectively. Also, the morphological properties of the nanocomposite were investigated by using X-ray diffraction and scanning electron microscopy. In addition, thermal properties of the nanocomposite were analyzed using differential scanning calorimetry, under various contents of graphene oxide. The results of the morphological test indicated that the graphene oxide was completely exfoliated into the polymeric matrix without any agglomeration
  6. Keywords:
  7. Graphene oxide ; UHMWPE ; Catalysts ; Differential scanning calorimetry ; Friction ; Graphene ; Molecular weight ; Nanocomposites ; Nonmetallic matrix composites ; Scanning electron microscopy ; Tribology ; Ultrahigh molecular weight polyethylenes ; X-ray diffraction ; Friction coefficients ; In-situ polymerization ; Morphological properties ; Polymeric matrices ; Tribological properties ; Ultra-high molecular ; Ziegler-Natta catalysts ; Polyethylenes
  8. Source: Polymers for Advanced Technologies ; Volume 27, Issue 9 , 2016 , Pages 1172-1178 ; 10427147 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/pat.3779/full