Effect of Processing and Radiation Exposure on the Structure and Properties of Polypropylene

Abstract:

While producing polymers as well as during their processing, a certain amount of stabilizers is introduced into the product, which should ensure polymer properties saving during processing and those of polymer products during storage and operation. However, in cases where medical products based on polypropylene are subjected to radiation sterilization, there are not enough stabilizers in it to save their characteristics during operation. In this regard, we made an assessment of the influence of processing conditions on the properties of polypropylene with a different set of stabilizers in the manufacture of products based on it, in order to assess the degree of influence of each technological operation, including the effects of ionizing radiation during sterilization. Processing and radiation exposure are shown to affect the properties of polypropylene. Nevertheless, the effect of ionizing radiation with an absorbed dose of 40-60 kGy exceeds the negative effect of thermo-oxidative breakdown greatly during the extrusion of PP. Polypropylene containing organophosphorus stabilizers (brand PP 1562R) is more susceptible to breakdown. This is indicated by low values of oxidation induction time, breakdown initial temperature, as well as high values of MFI after exposure to electron radiation. PP brand PP H350FF/1 whose stabilizing complex contains phenol-phosphite antioxidants is more resistant to breakdown during processing and sterilization. For both brands under study, it is apparently necessary to increase the content of stabilizing additives in order to save the properties at the level of the original unexposed material.

• Periodical: Key Engineering Materials (Volume 822)
• Pages: 355-361
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.822.355
• Online since: September 2019
• Authors: Maria S. Lisanevich*, Rezeda Yu. Galimzyanova, Elvina R. Rakhmatullina, Yuri N. Khakimullin, Ildar N. Musin, E.E. Tsareva
• Keywords: Ionizing Radiation, Melt Flow Index, Oxidation Induction Time, Polypropylene, Radiation Resistance, Thermogravimetric Analysis

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