The role of hydroperoxides as a precursor in the radiation-induced graft polymerization of methyl methacrylate to ultra-high molecular weight polyethylene |
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| Authors: | Ichiro Enomoto Yosuke Katsumura Hisaaki Kudo Masayuki Sekiguchi |
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| Affiliation: | 1. Tokyo Metropolitan Industrial Technology Research Institute, KFC bldg., 12F, 1-6-1, Yokoami, Sumida-ku, Tokyo 130-0015, Japan;2. School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata Shirane, Tokai-mura, Ibaraki 319-1195, Japan;1. Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10 Aomi, Koto-ku, Tokyo 135-0064, Japan;2. Environmental Radiation Processing Group, Environment and Industrial Materials Research Division, Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan;1. College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, PR China;2. Jiangsu Silk Technology and Materials Engineering Research Center, Suzhou Institute of Trade and Commerce, Suzhou 215009, PR China;3. National Engineering Laboratory for Modern Silk (Suzhou) , Suzhou 215123, PR China;4. Nantong Textile Institute of Soochow University, Nantong 226004, PR China;5. Faculty of Textile and Material, Xi’an Polytechnic University, Xi’an 710048, PR China;1. Pharmaceutical Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156, Iran;2. Department of Neuroscience, University of Wisconsin, Medical School, Madison, WI 53706-1532, USA;1. Academy of Scientific and Innovative Research (AcSIR), CSIR-North East Institute of Science & Technology, Jorhat 785006, Assam, India;2. CSIR-North East Institute of Science & Technology, Jorhat 785006, Assam, India |
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| Abstract: | ![]()
A graft polymerization of methyl methacrylate (MMA) to ultra-high molecular weight polyethylene (UHMWPE) with Co-60 γ-ray irradiation in air at room temperature has been carried out. The grafting yields were measured as a function of the storage time (elapsed time from the end of irradiation to the start of grafting), and it was found that the yields reach at the maximum values at around several days since the end of irradiation. In order to clarify the precursor of the graft polymerization, changes of the radical yields and the carbonyl groups were measured as a function of storage time with ESR and microscopic FT-IR, respectively. From the similarities between the depth profiles of the hydroperoxide formation and the grafting products, it was concluded that the hydroperoxides can be main precursors of the grafting of the radiation-induced polymerization of MMA to UHMWPE under the given conditions. |
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