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<p>This study examines the influence of pristine carbon nanotubes (CNTs) and 3-aminopropyltriethoxysilane-functionalized carbon nanotubes (aCNTs) on the curing characteristics, mechanical behavior, swelling resistance, and morphology of natural rubber/ethylene-propylene-diene monomer (NR/EPDM) composites. Filler loadings varied from 0 to 8 phr. Rheometric analysis showed that the inclusion of CNTs and aCNTs increased the minimum torque, maximum torque, torque difference, and cure rate index, while reducing scorch and optimum cure times, suggesting an accelerated vulcanization process. The incorporation of CNTs and aCNTs enhanced compound viscosity, hardness, and abrasion resistance, along with improved tear strength, compression set, and solvent resistance. Compared with the unfilled NR/EPDM blend, CNT-filled composites exhibited increases of 25% in tensile strength, 26% in 100% modulus, and 22% in tear strength, whereas elongation at break and rebound resilience decreased by 14% and 35%, respectively. Functionalized CNTs (aCNTs) provided further reinforcement, achieving 44% higher tensile strength, 48% higher modulus, and 32% higher tear strength, accompanied by 20% and 46% reductions in elongation at break and rebound resilience, respectively. The observed improvements are attributed to the effective incorporation and uniform distribution of CNTs within the elastomer matrix, leading to enhanced mechanical and swelling resistance performance of the NR/EPDM composites.</p>

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Comparative study on the effect of carbon nanotubes (CNTs) and aminosilane-functionalized CNTs on the mechanical properties and swelling resistance of NR/EPDM composites

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • S. Vishvanathperumal,
  • K. Sakthivel,
  • A. Arunkumar,
  • S. Mahalakshmi

摘要

This study examines the influence of pristine carbon nanotubes (CNTs) and 3-aminopropyltriethoxysilane-functionalized carbon nanotubes (aCNTs) on the curing characteristics, mechanical behavior, swelling resistance, and morphology of natural rubber/ethylene-propylene-diene monomer (NR/EPDM) composites. Filler loadings varied from 0 to 8 phr. Rheometric analysis showed that the inclusion of CNTs and aCNTs increased the minimum torque, maximum torque, torque difference, and cure rate index, while reducing scorch and optimum cure times, suggesting an accelerated vulcanization process. The incorporation of CNTs and aCNTs enhanced compound viscosity, hardness, and abrasion resistance, along with improved tear strength, compression set, and solvent resistance. Compared with the unfilled NR/EPDM blend, CNT-filled composites exhibited increases of 25% in tensile strength, 26% in 100% modulus, and 22% in tear strength, whereas elongation at break and rebound resilience decreased by 14% and 35%, respectively. Functionalized CNTs (aCNTs) provided further reinforcement, achieving 44% higher tensile strength, 48% higher modulus, and 32% higher tear strength, accompanied by 20% and 46% reductions in elongation at break and rebound resilience, respectively. The observed improvements are attributed to the effective incorporation and uniform distribution of CNTs within the elastomer matrix, leading to enhanced mechanical and swelling resistance performance of the NR/EPDM composites.