Effect of ionizing radiation on physicochemical and mechanical properties of commercial monolayer and multilayer semirigid plastics packaging materials |
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| Institution: | 1. Department of Materials Science and Technology, University of Ioannina, Ioannina GR-45110, Greece;2. Laboratory of Food Chemistry and Technology, Department of Chemistry, University of Ioannina, Ioannina GR-45110, Greece;1. Department of Energy Engineering, National United University, Miaoli 36003, Taiwan;2. Research Center for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei 11031, Taiwan;3. Department of Materials Science and Engineering, Feng Chia University, Taichung 40724, Taiwan;4. School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 11031, Taiwan;1. Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria;2. Borealis Polyole?ne GmbH, Innovation Headquarters, St. Peter Str. 25, 4021 Linz, Austria;1. Abbvie Inc., North Chicago, IL, United States;2. Novast Laboratories, Ltd., Nantong, China |
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| Abstract: | Tensile testing, overall migration tests and sensory tests were used to evaluate the effects of gamma irradiation (5–60 kGy) on six commercial semirigid packaging materials. The monolayer and multilayer materials in sheet or bottle form were: polystyrene (PS), polypropylene (PP), polyvinyl chloride/high-density polyethylene (PVC/HDPE), polyethylene terepthalate (PET), HDPE/polyamide (HDPE/PA) and HDPE. In terms of mechanical strength, PET was the most radiation-resistant material, while the HDPE monolayer and multilayer showed some degradation after 60 kGy. PS was slightly affected after 30 kGy, whereas PP was severly degraded and became very brittle. Generally, there was no change in overall migration at lower doses; at higher doses migration from PP tended to increase, while migration from HDPE/PVC tended to decrease. Odor and taste transfer as well as discoloration were observed with most plastics, especially at higher doses, and it is concluded that these tests are a sensitive and important quality control tool for evaluating irradiated packaging materials. |
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