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Thermal and spectroscopic analysis of stabilization effect of copper complexes in EPDM

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Abstract

The thermal stabilization effect of copper complexes on ethylene-propylene-diene terpolymer (EPDM) is studied during an accelerated degradation of polymer samples by their exposure to γ(137Cs)-radiation. These complexes of Cu(II) with two Schiff base ligands provided an efficient improvement in the stabilization of basic polymer. For the evaluation of improvement action of inorganic additive on thermal behavior of EPDM, the calculation of carbonyl and hydroxyl indexes and the radiochemical yields of corresponding radiolysis products prove the long-term stability of EPDM. Isothermal and nonisothermal chemiluminescence investigations were also accomplished, and the protection proficiencies of studied additives are compared by means of kinetic features of degradation. The activation energies required by the oxidation of polymer substrate were calculated, and their values are significant higher in comparison with the similar value found for pristine EPDM. The stabilized polymer is assisted by the interaction between mobile protons of ligands and hydrocarbon free radicals.

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Authors and Affiliations

  1. INCDIE ICPE CA, 313 Splaiul Unirii, 030138, Bucharest, Romania

    Traian Zaharescu

  2. Faculty of Chemistry, University of Bucharest, 23 Dumbrava Roşie Street, 020462, Bucharest, Romania

    Diana-Carolina Ilies & Tudor Roşu

  3. Faculty of Pharmacy, University of Medicine and Pharmacy “Carol Davila”, 6 Traian Vuia Street, 020956, Bucharest, Romania

    Diana-Carolina Ilies

Authors
  1. Traian Zaharescu
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  2. Diana-Carolina Ilies
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Correspondence to Traian Zaharescu.

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Zaharescu, T., Ilies, DC. & Roşu, T. Thermal and spectroscopic analysis of stabilization effect of copper complexes in EPDM. J Therm Anal Calorim 123, 231–239 (2016). https://doi.org/10.1007/s10973-015-4893-5

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