Radiation effects on polymer materials in radiation sterilization of medical supplies |
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| Institution: | 1. Department of Ophthalmology, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, California;2. Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida;3. Department of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, Minnesota;4. Clayton Eye Center, Morrow, Georgia;5. Department of Ophthalmology, Scheie Eye Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania;6. Department of Medicine, Stanford University School of Medicine, Palo Alto, California;7. Senta Clinic, San Diego, California;8. Division of Ophthalmology, Cedars-Sinai Medical Center, Los Angeles, California;1. Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain;2. CIBER de Enfermedades Respiratorias, Bunyola, Spain;3. Institut Investigacions Biomediques August Pi Sunyer, Barcelona, Spain;4. Institut de Bioenginyeria de Catalunya, Barcelona, Spain;5. Master?s and Doctoral Degree Programs in Rehabilitation Sciences, Nove de Julho University, Sao Paulo, Brazil;1. Chemistry and Pharmaceutical Engineering College, Nanyang Normal University, Nanyang, Henan 473061, PR China;2. Jiangsu Key Laboratory for Nano Technology, Eco-Materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing, Jiangsu 210093, PR China;3. Kunshan Innovation Institute of Nanjing University, Kunshan, Jiangsu 215300, PR China;1. Department of Neurosurgery, Henry Ford Hospital, Detroit, MI, USA;2. Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA;3. Department of Neurosurgery, Mayo Clinic, Rochester, MN, USA;4. Department of Neurosurgery, Brown University Warren Alpert Medical School, Providence, RI, USA |
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| Abstract: | Radiation degradations of polypropylene were studied by measuring chemiluminescence of the irradiated samples. The chemiluminescence emitted by recombination of peroxy radicals were found to increase with increasing dose, reflecting degree of oxidation of polymers. The degradation of PP may be attributed mainly to the oxidation, since the degradation of PP irradiated in air were markedly larger than that in vacuo. It was found that degree of oxidation of EB-irradiated PP was only one-half that for γ-ray-irradiated one. And also the degree of oxidation was found to be very high at the surface area of the film where oxygen can diffuse during irradiation and decrease sharply with increasing depth from the surface.The degradation during storage after irradiation were estimated by the decay curves of chemiluminescence. The degradation during storage occurred at earlier stage up to three months, while in later stage, it hardly proceeded. The degradation of EB-irradiated samples during storage was much smaller than that found in gamma rays irradiation. Irradiation of 2.5 Mrad with EB caused degradation only during storage. It was suggested that the degradation during storage depends on the degree of radiation oxidation. Both degradations, during irradiation and during storage after irradiation, caused by EB irradiation were also found to be smaller than those by γ-rays. The relationship between radiation degradation and degree of crystallinity of polypropylene was also discussed in this paper. |
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