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<p>In this study, ethylene-propylene-diene monomer/styrene-butadiene rubber (EPDM/SBR) nanocomposites were prepared using a two-roll mill mixing method, incorporating a hybrid filler of polyhedral oligomeric silsesquioxane (POSS) and multiwalled carbon nanotubes (MWCNT). The composites were evaluated for their cure characteristics, mechanical properties, abrasion resistance, compression set, swelling resistance, and crosslinking density. The results indicated that as the hybrid filler content increased, minimum torque, maximum torque, delta torque, and cure rate index decreased, whereas scorch time and optimum cure time increased. Mechanical testing revealed that tensile strength and stress at 100% elongation improved up to a filler concentration of 4 phr but declined beyond this level. Hardness and tear strength showed a continuous increase with higher filler loading, while elongation at break and rebound resilience decreased. Additionally, compression set increased with rising filler content. Swelling resistance and abrasion resistance were optimized at 4 phr of hybrid filler but deteriorated when the filler concentration exceeded this threshold.</p>

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Polyhedral Oligomeric Silsesquioxane/Multiwalled Carbon Nanotube (MWCNT/POSS) Hybrid Filler in Ethylene-Propylene-Diene Monomer/Styrene-Butadiene Rubber (EPDM/SBR) Nanocomposites: Preparation and Properties

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • B. Dhanasakkaravarthi,
  • S. Vishvanathperumal,
  • S. Arunkumar,
  • A. Arunkumar

摘要

In this study, ethylene-propylene-diene monomer/styrene-butadiene rubber (EPDM/SBR) nanocomposites were prepared using a two-roll mill mixing method, incorporating a hybrid filler of polyhedral oligomeric silsesquioxane (POSS) and multiwalled carbon nanotubes (MWCNT). The composites were evaluated for their cure characteristics, mechanical properties, abrasion resistance, compression set, swelling resistance, and crosslinking density. The results indicated that as the hybrid filler content increased, minimum torque, maximum torque, delta torque, and cure rate index decreased, whereas scorch time and optimum cure time increased. Mechanical testing revealed that tensile strength and stress at 100% elongation improved up to a filler concentration of 4 phr but declined beyond this level. Hardness and tear strength showed a continuous increase with higher filler loading, while elongation at break and rebound resilience decreased. Additionally, compression set increased with rising filler content. Swelling resistance and abrasion resistance were optimized at 4 phr of hybrid filler but deteriorated when the filler concentration exceeded this threshold.