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Physico-chemical behaviour of β irradiated plastic materials currently used as packagings and medical products

1995; Elsevier BV; Volume: 105; Issue: 1-4 Linguagem: Inglês

10.1016/0168-583x(95)00638-9

1872-9584

Najet Yagoubi, A. Baillet, F Pellerin, D. Ferrier,

Polymer Nanocomposite Synthesis and Irradiation

Abstract The combined chromatographic technics and thermal analysis constitute an informative methodology for studying the modifications which could occur following a radiotreatment of plastic material at different doses (25 to 100 kGy). Several plastic materials used as packagings (PVC, PE, PS) were investigated. SEC method coupled with UV and DDL detections was applied to document any changes in molecular weight distribution. Reticulation and scission were the main observed degradation phenomena. These structural modifications were supported by TGA data, while the DSC provided information on modifications in crystallinity. In addition, RP-HPLC was carried out for the evaluation of the radiochemical behaviour of the additives and monomers. Firstly we demonstrated the degradation of high molecular weight phenolic antioxidants in BHT within the PEVA. Secondly, the modifications of amino 6 caproic acid and e caprolactam, present in polyamid 6, depend on the irradiation doses.