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<p>This work investigates the enhancement of hydrogenated nitrile butadiene rubber (HNBR) through modification with ethylphenylsilylurea (EPSU), a novel organosilicon crosslinking agent. EPSU was synthesized via the reaction of ethylphenyldichlorosilane with urea, yielding a multifunctional additive capable of reinforcing the rubber matrix. Incorporation of EPSU into HNBR significantly improved vulcanization kinetics, especially at 150&#xa0;°C, where optimal crosslink density and curing efficiency were achieved. Mechanical testing revealed that EPSU-modified composites exhibit superior tensile strength, tear resistance, and Shore A hardness, with 1.5 phr EPSU providing the best performance. Resistance to aggressive environments—including oils, toluene, hydrochloric acid, and nitric acid—was enhanced by 30–50%, owing to the formation of a denser and chemically stable siloxane-urea crosslinked network. These results confirm the potential of EPSU as a high-performance reinforcing agent for HNBR-based elastomers intended for chemically and thermally demanding industrial applications.</p>

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Enhanced chemical resistance and mechanical properties of HNBR elastomers via ethylphenylsilylurea (EPSU) based crosslinking modification

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Rana Khankishiyeva,
  • Ali Mammadov,
  • Haji Vahid Akhundzada,
  • Gunel Mammadova,
  • Vugar Khudaverdiev,
  • Aida Azizova,
  • Akif Salehov,
  • Sanam Valiyeva,
  • A. K. M. Moshiul Alam

摘要

This work investigates the enhancement of hydrogenated nitrile butadiene rubber (HNBR) through modification with ethylphenylsilylurea (EPSU), a novel organosilicon crosslinking agent. EPSU was synthesized via the reaction of ethylphenyldichlorosilane with urea, yielding a multifunctional additive capable of reinforcing the rubber matrix. Incorporation of EPSU into HNBR significantly improved vulcanization kinetics, especially at 150 °C, where optimal crosslink density and curing efficiency were achieved. Mechanical testing revealed that EPSU-modified composites exhibit superior tensile strength, tear resistance, and Shore A hardness, with 1.5 phr EPSU providing the best performance. Resistance to aggressive environments—including oils, toluene, hydrochloric acid, and nitric acid—was enhanced by 30–50%, owing to the formation of a denser and chemically stable siloxane-urea crosslinked network. These results confirm the potential of EPSU as a high-performance reinforcing agent for HNBR-based elastomers intended for chemically and thermally demanding industrial applications.