Degradability characterization of EPDM/IIR blends by γ-irradiation
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Journal of Polymers and the Environment
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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.
Como referenciar
ZAHARESCU, TRAIAN; SCAGLIUSI, SANDRA R.; LUCHIAN, ANA M.; LUGAO, ADEMAR B. Degradability characterization of EPDM/IIR blends by γ-irradiation. Journal of Polymers and the Environment, v. 26, n. 2, p. 616-625, 2018. DOI: 10.1007/s10924-017-0966-9. Disponível em: http://repositorio.ipen.br/handle/123456789/27867. Acesso em: 30 Dec 2025.
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