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Report No.
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Change of the micro structure of ultra high molecular weight polyethylene by irradiation

Enomoto, Ichiro*; Soeda, Shin*; Ikeda, Shigetoshi*; Kudo, Hisaaki*; Katsumura, Yosuke

Ultra High Molecular Weight Polyethylene (UHMWPE) is applied as industrial material in many fields because it has properties of lightness in weight and of high endurance. Its surface needs to be reformed to overcome its deficit of low adhesion property toward other materials. It is known that radiation graft polymerization is effective to reform surfaces of hydrophobic polymeric materials although material properties may decrease due to scissions and oxidations induced by radiolytic radicals. It is believed that such effects of irradiations appear in amorphous regions and does not in crystalline regions. However, it is recently reported by using DSC measurement or XRD analysis that irradiations can affect not only amorphous but also crystalline region. This work investigates change of microscopic structures of UHMWPE in surface region of $$sim$$100 $$mu$$m, which is responsible for radiation graft polymerization. Analyses were conducted by combination of several techniques such as FT-IR, DSC, XRD and ESR.

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