Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Mechanical Properties of Ultra-High Molecular Weight Polyethylene Irradiated with Gamma Rays

  • Lee, Choon-Soo (Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University) ;
  • Yoo, Seung-Hoo (Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University) ;
  • Jho, Jae-Young (Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University) ;
  • Park, Kuiwon (Biomedical Research Center, Korea Institute of Science and Technology) ;
  • Hwang, Tae-Won (Research and Development Division for Hyundai Motor Company and Kia Motors Corporation)
  • Published : 2004.02.01
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Abstract

With the goal of enhancing the creep resistance of ultra-high molecular weight polyethylene (UHMWPE), we performed gamma irradiation and post-irradiation annealing at a low temperature, and investigated the crystalline structures and mechanical properties of the samples. Electron spin resonance spectra reveal that most of the residual radicals are stabilized by annealing at 100$^{\circ}C$ for 72 h under vacuum. Both the melting temperature and crystallinity increase after increasing the dose and by post-irradiation annealing. When irradiated with the same dose, the quenched sample having a higher amorphous fraction exhibits a lower swell ratio than does the slow-cooled sample. The measured tensile properties correlate well to the crystalline structure of the irradiated and annealed samples. For enhancing creep resistance, high crystallinity appears to be more critical than a high degree of crosslinking.

Keywords

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