Influence of molecular and crosslink network structure on vulcanizate properties of EPDM elastomers

Parathodika, Arshad Rahman; Sreethu, T. K.; Maji, Purbasha; Susoff, Markus; Naskar, Kinsuk

doi:10.3144/expresspolymlett.2023.54

Cited by 4 publications

(2 citation statements)

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“…EPDM alkyl and allyl macroradicals can also add to the double bonds in diene monomer units. For steric reasons, the macromolecular radical thus formed would not propagate with another diene unit, but probably terminates via hydrogen transfer with the formation of allyl/alkene and alkyl/alkene cross-links [ 32 , 33 , 34 , 35 , 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…The recombination of alkyl and allyl macroradicals leads to formation of allyl/allyl, alkyl/alkyl and alkyl/allyl cross-link combinations. EPDM and allyl macroradicals can also add to the double bonds in diene monomer units steric reasons, the macromolecular radical thus formed would not propagate with ano diene unit, but probably terminates via hydrogen transfer with the formation of ally kene and alkyl/alkene cross-links [32][33][34][35][36][37].…”

Section: Cross-link Densitymentioning

confidence: 99%

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Combined Sulfur and Peroxide Vulcanization of Filled and Unfilled EPDM-Based Rubber Compounds

et al. 2023

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The sulfur curing system, peroxide curing system and their combinations were applied for the cross-linking of unfilled and carbon black-filled rubber formulations based on ethylene-propylenediene-monomer rubber. The results demonstrated that the type of curing system influenced the course and shape of curing isotherms. This resulted in the change of curing kinetics of rubber compounds. The cross-link density of materials cured with combined vulcanization systems was lower than that for vulcanizates cured with the peroxide or sulfur system. Good correlation between the cross-link density as well as the structure of the formed cross-links and physical–mechanical characteristics of the cured materials was established. Both filled and unfilled vulcanizates cured with combined vulcanization systems exhibited a higher tensile strength and elongation at break when compared to their equivalents vulcanized in the presence of the peroxide or sulfur curing system. It can be stated that by proper combination of vulcanization systems, it is possible to modify the tensile behavior of vulcanizates in a targeted manner. On the other side, dynamical–mechanical properties were found not be significantly influenced by the curing system composition.

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