The structural and mechanical properties of the UHMWPE films mixed with the PE-Wax

Tarek Dayyoub*, Leonid K. Olifirov, Dilyus I. Chukov, Sergey D. Kaloshkin, Evgeniy Kolesnikov, Saidkhodzha Nematulloev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Since obtaining a highly oriented structure based on a large-scale commercial ultra-high molecular weight polyethylene (UHMWPE) is considered very difficult due to its high molecular weight and melting index, modifying the structure of these cheap commercial UHMWPE brands into a supra-molecular structure with fiber-forming properties by adding a small amount of polyethylene wax (PE-wax) will provide the possibility to obtain highly orientedUHMWPEproducts with enhanced mechanical and tribological properties. In this work, highly oriented UHMWPE/PE-wax films were prepared. The PE-wax affected the UHMWPE as an intermolecular lubricant. The obtained lamellar structure of the UHMWPE/PE-wax composites had a better processability. The UHMWPE and UHMWPE/PE-wax structures for the xerogels and the films were studied by using differential scanning calorimetry and scanning electron microscopy. The PE-wax presence enhanced the mechanical properties of the UHMWPE/PE-wax films to a high degree. The highest average value of the tensile strength was 1320 MPa (an increase of 78%) obtained by adding a PE-wax content of 1.0 wt. %, and the highest average value of the Young's modulus was 56.8 GPa (an increase of 71%) obtained by adding a PE-wax content of 2.0 wt. %. The addition of the PE-wax increased the work of fracture values of the UHMWPE/PE-wax films up to 233%. The formation of the cavities was observed in the virgin UHMWPE films more than in the UHMWPE/PE-wax films, and the whitening of the oriented films was related to the crystallization process more than to the cavitation phenomenon. The coefficient of friction of the oriented UHMWPE/PE-wax films improved by 33% in comparison with the isotropic UHMWPE, and by 7% in comparison with the oriented virgin UHMWPE films.

Original languageEnglish (US)
Article number3422
Pages (from-to)1-18
Number of pages18
JournalMATERIALS
Volume13
Issue number15
DOIs
StatePublished - Aug 2020

Keywords

  • Cavitation phenomena
  • Crystallization
  • Films
  • Lamellar structure
  • Mechanical and tribological properties
  • PE-wax
  • UHMWPE
  • Work of fracture

ASJC Scopus subject areas

  • General Materials Science

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