Radiation-induced degradation of polyethylene: Role of amorphous region in the formation of oxygenated products and the mechanical properties |
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| Institution: | 1. Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University, Furo-Cho, Chikusa-ku, Nagoya 464, Japan;2. Rubbers and Plastics Material Laboratories, Showa Electric Wire and Cable Co. Ltd, Odasakae, Kawasaki-ku, Kawasaki 210, Kanagawa, Japan;1. Nanotechnology Centre, VŠB – Technical University of Ostrava, 17. listopadu 15/2172, CZ-708 33 Ostrava, Poruba, Czech Republic;2. IT4Innovations Centre of Excelence, VŠB – Technical University of Ostrava, 17. listopadu 15/2172, CZ-708 33 Ostrava, Poruba, Czech Republic;3. Centre of Polymer Systems, University Institute, Tomáš Bat''a University in Zlín, Nad Ovčírnou 3685, CZ-760 01 Zlín, Czech Republic;4. Institute of Public Health Ostrava, Centre of Clinical Laboratories, Partyzánské náměstí 7, CZ-702 00 Ostrava, Czech Republic;5. SPUR a.s., tř. T. Bati 299, CZ-764 22 Zlín, Czech Republic;1. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084, Fisciano (SA), Italy;2. NANO_MATES, Research Centre for Nanomaterials and Nanotechnology at the University of Salerno, University of Salerno, Via Giovanni Paolo II, 132, 84084, Fisciano (SA), Italy;3. Department of Environment, Global Change and Sustainable Development, C.R. ENEA Portici, Via Vecchio Macello Loc. Granatello, 80055, Portici, NA, Italy;1. Advanced Polymer Laboratory, Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore 45650, Islamabad, Pakistan;2. Department of Environmental Sciences, Fatima Jinnah Women University, Rawalpindi 46000, Pakistan;1. School of Physics, Gangadhar Meher University, Sambalpur 768001, India;2. Department of Physics, C. V. Raman College of Engineering, Bhubaneswar 752054, India;3. Department of Mechanical Engineering, Institute of Technical and Engineering Research (ITER), Siksha-O-Anusandhan (SOA) University (Deemed to be), Bhubaneswar 751030, India;4. Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela 769008, India;1. University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, New Delhi 110078, India;2. Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005, India;3. UGC-DAE Consortium for Scientific Research, III/LB-8, Bidhannagar, Kolkata 700098, India |
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| Abstract: | Quenched samples of linear low density, medium density and two kinds of high density polyethylene films were irradiated with γ-rays from a 60Co source in vacuum and in air at room temperature with irradiation doses ranging from 0 to 100 Mrad. On irradiation in vacuum the extent of crosslinking was about one-and-a-half times greater in the linear low density polyethylene (LLDPE) than in the high density polyethylene (HDPE). On the other hand, irradiation in air produced more crosslinking in high density polyethylene (HDPE). Growth of trans-vinylene unsaturation was found around 10 Mrad in all the samples. Initial increase in elongation and breaking strength (below 5 Mrad) occurred, which was followed by a decrease with increasing dose. LLDPE showed some elongation even at 50 Mrad, while the other samples became brittle and broke at doses far below this value. The mechanism of oxidative degradation is discussed. |
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