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<p>In this study, the effects of two different organic peroxides, dicumyl peroxide (DCP) and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (DPBH), on the curing kinetics, crosslink density, mechanical properties, thermomechanical behavior, energy dissipation, and thermal stability of fluorosilicone rubber (FSR) elastomers were investigated. The compounds were prepared with identical peroxide ratios, and the vulcanization behaviors were analyzed through rheometry and kinetic modeling. The mechanical performance, thermo-mechanical relaxation (TSSR), energy dissipation, and thermal stability were systematically evaluated. The crosslink density was measured using both the Flory-Rehner swelling method and the Lee-Pawlowski-Coran (LPC) approach, highlighting the distinct effect of DCP in promoting a higher chemical crosslink density. The results showed that the DCP-cured elastomer (KAR2) had a faster cure, higher crosslink density, greater hardness, and better thermal resistance compared to the DPBH-cured elastomer (KAR1). These findings underscore the critical role of peroxide type in tailoring the structural and functional performance of FSR-based materials for high-demand applications.</p>

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Effect of organic peroxide type on the network formation and performance of fluorosilicone rubbers

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Davut Aksüt

摘要

In this study, the effects of two different organic peroxides, dicumyl peroxide (DCP) and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (DPBH), on the curing kinetics, crosslink density, mechanical properties, thermomechanical behavior, energy dissipation, and thermal stability of fluorosilicone rubber (FSR) elastomers were investigated. The compounds were prepared with identical peroxide ratios, and the vulcanization behaviors were analyzed through rheometry and kinetic modeling. The mechanical performance, thermo-mechanical relaxation (TSSR), energy dissipation, and thermal stability were systematically evaluated. The crosslink density was measured using both the Flory-Rehner swelling method and the Lee-Pawlowski-Coran (LPC) approach, highlighting the distinct effect of DCP in promoting a higher chemical crosslink density. The results showed that the DCP-cured elastomer (KAR2) had a faster cure, higher crosslink density, greater hardness, and better thermal resistance compared to the DPBH-cured elastomer (KAR1). These findings underscore the critical role of peroxide type in tailoring the structural and functional performance of FSR-based materials for high-demand applications.