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SiO 2 -covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO 2 ) nanocomposites with superior mechanical and tribological properties

Haddadi, S. A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1002/app.47796
  3. Publisher: John Wiley and Sons Inc , 2019
  4. Abstract:
  5. The modified Hummer technique was used in the preparation of graphene oxide (GO) nanosheets, and then SiO 2 decorated GO [GO(SiO 2 )] nanosheets were synthesized via the sol–gel method. Then, ultrahigh-molecular-weight polyethylene (UHMWPE) nanocomposites loaded with 0.5, 1, 1.5, and 2 wt % of GO(SiO 2 ) were prepared using magnesium ethoxide/GO(SiO 2 )-supported Ziegler–Natta catalysts via the in situ polymerization. Morphological study of the prepared polymer powders was assessed using field-emission scanning electron microscopy, which showed that GO(SiO 2 ) nanohybrids have been uniformly dispersed and distributed into the UHMWPE matrix. Also, the neat UHMWPE and its nanocomposites were evaluated with different analyses, including viscosity-average molecular weight measurement, differential scanning calorimetry, thermogravimetric analysis, tensile test, scratch hardness, and pin-on-disk test. The characterization of the UHMWPE nanocomposites indicated that many characterizations, including the mechanical, thermal, and tribological properties of UHMWPE, were significantly improved by incorporation of these new nanosheets in spite of the molecular weight reduction of the polymeric matrix and the improved flowability and processability of the produced nanocomposite. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47796. © 2019 Wiley Periodicals, Inc
  6. Keywords:
  7. In-situ polymerization ; SiO 2 -covered graphene oxide nanohybrids ; UHMWPE nanocomposites ; Ziegler-Natta catalyst ; Differential scanning calorimetry ; Field emission microscopes ; Graphene ; Magnesium compounds ; Molecular weight ; Nanocatalysts ; Nanocomposites ; Nanosheets ; Nanostructured materials ; Polymer matrix composites ; Polymerization ; Scanning electron microscopy ; Silica ; Sols ; Tensile testing ; Thermogravimetric analysis ; Tribology ; Ultrahigh molecular weight polyethylenes ; Weighing ; Field emission scanning electron microscopy ; Graphene oxide nanosheet ; Mechanical and tribological properties ; Molecular weight reductions ; Nanohybrids ; Viscosity average molecular weight ; Ziegler-Natta catalysts ; SiO2 nanoparticles
  8. Source: Journal of Applied Polymer Science ; Volume 136, Issue 31 , 2019 ; 00218995 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/full/10.1002/app.47796