Structural and mechanical properties of nitrogen ion implanted ultra high molecular weight polyethylyne

J. S. Chen, Shu Ping Lau, Z. Sun, B. K. Tay, G. Q. Yu, F. Y. Zhu, D. Z. Zhu, H. J. Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

66 Citations (Scopus)

Abstract

The structural and mechanical properties have been studied for ultra high molecular weight polyethylene (UHMWPE) implanted by 80 ke V N2+, (40 ke V N+) with fluencies ranging from 1 × 1014to 5 × 1015ions/cm2. Elastic recoil detection (ERD), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) have been employed to study the structural change of UHMWPE before and after implantation. ERD results show that the high-energy edge of ERD spectra shifts to the lower energy with an increase in implantation fluence, indicating that a hydrogen deficient surface layer is formed after implantation. From Raman spectra it is observed that the chain structure of UHMWPE has been damaged due to ion implantation and when the fluence exceeds 1 × 1015ions/cm2, a layer of hydrogenated amorphous carbon is formed. The XPS result shows that the injected nitrogen atoms form chemical bonds with the polymer instead of forming precipitates by self-clustering. The hardness and Young's modulus of the UHMWPE determined by nanoindenter increase with increased fluence. The hardness and Young's modulus of the UHMWPE implanted with the fluence of 5 × 1015ions/cm2is four and two times higher than those of unimplanted UHMWPE, respectively.
Original languageEnglish
Pages (from-to)33-38
Number of pages6
JournalSurface and Coatings Technology
Volume138
Issue number1
DOIs
Publication statusPublished - 2 Apr 2001
Externally publishedYes

Keywords

  • Elastic recoil detection
  • Nitrogen ion
  • Ultra high molecular weight polythene
  • Young's modulus

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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