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Kinetic effects of silica nanoparticles on thermal and radiation stability of polyolefins

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Abstract

The effects of γ-irradiation as the accelerated degradation procedure were analyzed for the evaluation of material stability. Low density polyethylene, polypropylene and ethylene–propylene terpolymer were studied in formulations with SiO2 nanoparticles (2 and 5 wt%) or as neat materials. High energy irradiation (up to 100 kGy) has revealed a faster increase in the absorption of carbonyl band in comparison with the corresponding change in hydroperoxide band. The three studied materials present increased oxidation rates as the received energy transferred from incidental rays is enhancing, because the thermal regime of degradation depends on the structural characteristics, namely initial number of tertiary carbon atoms and unsaturation level. The fate of hydroperoxides as oxidation initiators is discussed.

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Authors and Affiliations

  1. National Institute for R&D in Electrical Engineering, 313 Splaiul Unirii, 030138, Bucharest, Romania

    Traian Zaharescu & Ilona Plesa

  2. Faculty of Sciences, University VALACHIA Targoviste, 18-24 Unirii Av., 130082, Targoviste, Romania

    Silviu Jipa

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  1. Traian Zaharescu
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  2. Ilona Plesa
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Correspondence to Traian Zaharescu.

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Zaharescu, T., Plesa, I. & Jipa, S. Kinetic effects of silica nanoparticles on thermal and radiation stability of polyolefins. Polym. Bull. 70, 2981–2994 (2013). https://doi.org/10.1007/s00289-013-1001-5

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