1987
DOI: 10.1002/app.1987.070340613
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Aging of EPDM rubber

Abstract: synopsisThe effect of oxidative and thermal aging of EPDM raw rubber and rubber vulcanizate on gelation, network structure, and technical properties has been studied over a wide range of temperaand tin~ea of aging. Three grades of EPDM having different types of dime have been conaidered. The kinetics of aging of both raw rubber and vulcanizates has also been reported. Different network structures have been produced due to different reactivity of tmonomers. Cmselink density, -link effiaency, polysulfidic linkag… Show more

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Cited by 46 publications
(31 citation statements)
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“…The activation energy for the reaction between HDA and the cross-links (Ea 1 ) is derived to be 73.19 kJ/mol. Deuri and Bhowmick (1987) reported the values for thermal desulfurization of polysulfidic cross-links in various grades of EPDM vulcanizates to be in the range of 60-85 kJ/mol in air and 95 kJ/mol in nitrogen environment. The value of the activation energy obtained in this research seems to be within this range, although in the devulcanization reaction conducted, not only polysulfidic, but also disulfidic and monosulfidic cross-link scission and main-chain scission might occur.…”
Section: Competition Between the Reaction Termsmentioning
confidence: 99%
“…The activation energy for the reaction between HDA and the cross-links (Ea 1 ) is derived to be 73.19 kJ/mol. Deuri and Bhowmick (1987) reported the values for thermal desulfurization of polysulfidic cross-links in various grades of EPDM vulcanizates to be in the range of 60-85 kJ/mol in air and 95 kJ/mol in nitrogen environment. The value of the activation energy obtained in this research seems to be within this range, although in the devulcanization reaction conducted, not only polysulfidic, but also disulfidic and monosulfidic cross-link scission and main-chain scission might occur.…”
Section: Competition Between the Reaction Termsmentioning
confidence: 99%
“…The exponent value (n) is selected as 1.69, using the average, and the constant value (k) affecting the SED function is fitted to the arc tangent and expressed as (7). Finally, the Arrhenius equation is substituted into (7) to derive the aged master curve as (8).…”
Section: Sed-function Master Curvementioning
confidence: 99%
“…Therefore, in most product-development stages, accelerated [5,6] test methods are mainly used, which are tested with aged rubber material under severe conditions. The physical-property change parameters for the aged rubber are typically evaluated using the hardness, tensile strength, permanent set, and elongation [7][8][9]. However, as the mechanical behavior is only apparent through experimental analysis and cannot demonstrate the fundamental reaction of the aged rubber, researchers have attempted to evaluate the aging characteristics using the crosslink density [10][11][12].…”
Section: Introductionmentioning
confidence: 99%
“…Deuri and Bhowmick also found a gel of raw EPDM rubber after extraction by the solvent, and this gel content increased with aging time without any compounding ingredients. 39 It is well known that the rubber without compounding ingredients also forms a cross-link by thermal aging. 39 Figure 9 shows the DSC heating curves of PBS and annealed blend samples of PBS/EPDM-MAH and PBS/EB-MAH.…”
Section: Annealing Effect On Interfacial Adhesionmentioning
confidence: 99%