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Journal of Polymers and the Environment

, Volume 26, Issue 2, pp 616–625 | Cite as

Degradability Characterization of EPDM/IIR Blends by γ-irradiation

  • Traian Zaharescu
  • Sandra R. Scagliusi
  • Ana Maria Luchian
  • Ademar B. Lugão
Original Paper

Abstract

In this paper the modifications induced in butyl rubbers (pristine, chlorinated and brominated sorts) by γ-irradiation are investigated by swelling, chemiluminescence and FT-IR. The susceptibility of butyl rubbers for the generation of radicals orders their stabilities in the following sequence: IIR > IIR—Cl > IIR—Br. The incorporation of butyl rubbers into ethylene-propylene terpolymer matrix brings about increased densities of radicals initiating modifications in the oxidation state in respect with recombination, which are intensified as the processing dose increases. Based on the variation of carbonyl and hydroxyl indices the favorable route for the recycling EPDM based formulations would be suggested in this study. The chemiluminescence spectra proving the formation of peroxyl radicals at about 100 °C prove their availability as reclaiming solutions. IIR—Br is the recommendable butyl rubber for the recovery procedure by association with EPDM. The suitability of IIRs for recycling purposes is analyzed by the variation in their crosslink densities, free volumes and swelling degrees. The crosslinking behavior of stabilized EPDM/IIR blends that runs to the improvement of durability is depicted by Charlesby–Pinner representation, which involves the different simultaneous contribution of scission and crosslinking processes.

Keywords

EPDM Halogenated IIR Degradation Oxidation Recycling γ-Irradiation 

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Traian Zaharescu
    • 1
  • Sandra R. Scagliusi
    • 2
  • Ana Maria Luchian
    • 1
  • Ademar B. Lugão
    • 2
  1. 1.Radiochemistry CenterNational Institute for Electrical Engineering (INCDIE, ICPE-CA)BucharestRomania
  2. 2.Instituto de Pesquisas Energéticas e Nucleares (IPEN – CNEN/SP)São PauloBrazil

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