Evaluation of Oxidative Degradation of Ultra-High-Molecular-Weight Polyethylene Irradiated by Gamma-Ray

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  • Wakamatsu Fumiya
    Course of Biomedical Engineering, Graduate School of Engineering, Tokai University
  • Kikugawa Hisao
    Course of Biomedical Engineering, Graduate School of Engineering, Tokai University Department of Biomedical Engineering, School of Engineering, Tokai University
  • Asaka Takashi
    Department of Applied Chemistry, School of Engineering, Tokai University

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  • ガンマ線照射超高分子量ポリエチレンの酸化劣化の評価
  • ガンマセン ショウシャ チョウコウブンシリョウ ポリエチレン ノ サンカ レッカ ノ ヒョウカ

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Abstract

<p>In this study, the oxidative degradation of gamma-irradiated ultra-high-molecular-weight polyethylene (UHMWPE) was evaluated. Tensile yield stress, Young’s modulus, and Vickers hardness were measured to characterize oxidative deterioration. Furthermore, we evaluated the existence of residual radicals by the electron spin resonance (ESR) analysis, and discussed the relationship between ESR spectra change and mechanical property indexes. In the tensile test of small UHMWPE specimens, it is often difficult to measure the strain. Therefore, we tried to estimate the Young’s modulus simply by using Hertz’s theory of elastic contact, and confirmed its usefulness. It is possible to estimate the tensile Young’s modulus from the indentation test in this experimental range. This method is applicable to evaluate the relationship between mechanical properties such as Young’s modulus and ESR properties over a long term after irradiation.</p>

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