SiO2‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO2) nanocomposites with superior mechanical and tribological properties

Seyyed Arash Haddadi, Ahmad Ramazani Saadat Abadi, Amanj Kheradmand, Majed Amini, Mohammad Ramezanzadeh

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The modified Hummer technique was used in the preparation of graphene oxide (GO) nanosheets, and then SiO2 decorated GO [GO(SiO2)] 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(SiO2) were prepared using magnesium ethoxide/GO(SiO2)‐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(SiO2) 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.

Original languageEnglish
Article number47796
Number of pages17
JournalJournal of Applied Polymer Science
Volume136
Issue number31
DOIs
Publication statusPublished - 15 Aug 2019
Externally publishedYes

Keywords

  • in-situ polymerization
  • SiO₂-covered graphene oxide nanohybrids
  • UHMWPE nanocomposites
  • Ziegler-Natta catalyst

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