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Enomoto, Ichiro*; Soeda, Shin*; Ikeda, Shigetoshi*; Kudo, Hisaaki*; Katsumura, Yosuke
no journal, ,
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 
100 
m, which is responsible for radiation graft polymerization. Analyses were conducted by combination of several techniques such as FT-IR, DSC, XRD and ESR.
Enomoto, Ichiro*; Soeda, Shin*; Katsumura, Yosuke; Kudo, Hisaaki*
no journal, ,
Ultra high molecular weight polyethylene (UHMWPE) has been widely used for industrial and biomaterials due to its chemical inertness, impact resistance and abrasion resistance. However, because of no reactive group on a polyethylene backbone or low surface energy, the surface is hydrophobic, not adhesive and has a low dyeing affinity. Therefore, surface treatment has been applied to modify the property. Especially, the radiation induced graft polymerization method is excellent to maintain the modification for a prolonged period. We investigated efficiency of graft polymerization of acrylic acid (AA), methyl methacrylate (MMA) and styrene (St) to the UHMWPE fiber irradiated in surface modification. Mechanisms of reactions in the radiation graft polymerization were also investigated.
Enomoto, Ichiro*; Katsumura, Yosuke; Kudo, Hisaaki*; Soeda, Shin*
no journal, ,
Ultra high molecular weight polyethylene (UHMWPE) has been widely used for industrial and biomaterials due to its chemical inertness, impact resistance and abrasion resistance. However, because of no reactive group on a polyethylene backbone or low surface energy, the surface is hydrophobic, not adhesive and has a low dyeing affinity. Therefore, surface treatment has been applied to modify the property. Especially, the radiation induced graft polymerization method is excellent to maintain the modification for a prolonged period. We investigated efficiency of graft polymerization of acrylic acid (AA), methyl methacrylate (MMA) and styrene (St) to the UHMWPE fiber irradiated in surface modification. Mechanisms of reactions in the radiation graft polymerization were also investigated. Especially, role of hydroperoxide as a precursor of radiation-induced polymerization was investigated.
Enomoto, Ichiro*; Katsumura, Yosuke; Soeda, Shin*; Fujishiro, Satoshi*
no journal, ,
no abstracts in English