The effects of high energy electron beam irradiation on the thermal and structural properties of low density polyethylene |
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| Authors: | Kieran A Murray James E Kennedy Brian McEvoy Olivier Vrain Damien Ryan Clement L Higginbotham |
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| Institution: | 1. Materials Research Institute, Athlone Institute of Technology, Athlone, Ireland;2. Isotron, IDA Business & Technology Park, Tullamore, Co. Offaly, Ireland;1. Department of Physics, Zhejiang University, Hangzhou 310027, China;2. Soft Matter Research Center, Zhejiang University, Hangzhou 310027, China;1. Delft University of Technology, Fac. Appl. Sciences, Charged Particle Optics Group, Lorentzweg 1, 2628 CJ Delft, The Netherlands;2. Delft University of Technology, Kavli Institute of Nanoscience, Lorentzweg 1, 2628 CJ Delft, The Netherlands;1. Nuclear Engineering Group, Department of Mechanical Engineering, Exhibition Road, South Kensington Campus, Imperial College London, SW7 2AZ, UK;2. Department of Nuclear Engineering, University of New Mexico, Albuquerque, NM 87131, USA;1. Research Institute for Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan;2. Institute of Scientific and Industrial Research, Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan |
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| Abstract: | Radiation is currently being exploited to modify polyethylene in order to improve properties for various applications such as hip replacements. This paper thoroughly examines the effects of high energy electron beam irradiation (10 MeV) on low density polyethylene (LDPE) material. ASTM (American Society for Testing and Materials) testing specimens were manufactured from LDPE and subjected to a broad range of doses ranging between 25 and 400 kGy at room temperature in an air atmosphere. Extensive characterisation techniques such as modulated differential scanning calorimetry (MDSC) and the Fourier transform infrared spectroscopy (FTIR) were conducted on the non-irradiated and irradiated samples. While considering the semicrystalline nature of LDPE during the MDSC experiment, the melting temperature (Tm) and the temperature crystallinity (Tc) were calculated. This revealed that the Tm and the Tc decreased in temperature as the irradiation dose increased. The FTIR analysis was implemented to evaluate the presence of polar species such as carbonyl groups and trans-vinylene double bond groups. The IR spectra illustrated that the concentration of characteristic bands for trans-vinylene bonds increased with increasing radiation dose indicating the formation of carbonyl bond groups. Furthermore, the results demonstrated an occurrence of oxidative degradation due to the formation of carbonyl groups at 1718 cm?1. |
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