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<p>This work focused on modifying the surface of nanosilica (NS) with two interfacial agents, namely bis[3-(triethoxysilyl)propyl] tetrasulfide (TESPT) and thioctic acid (TA). The resulting modified fillers—TESPT-modified nanosilica (TEmNS) and thioctic acid-modified nanosilica (TAmNS)—were incorporated into nanocomposites based on a chlorinated ethylene propylene diene monomer (Cl-EPDM) and chlorinated acrylonitrile butadiene rubber (Cl-NBR) blend. The influence of the fillers on key properties such as cure behavior, tensile strength, hardness, rebound resilience, and compression set was systematically examined. Complementary analyses encompassed swelling behavior, crosslink density, abrasion resistance, and fracture morphology using field emission scanning electron microscopy (FESEM). Among the investigated systems, TAmNS provided the most pronounced enhancements, improving tensile strength, stress at 100% elongation, tear strength, hardness, abrasion resistance, and curing performance. In particular, TAmNS-reinforced composites displayed superior resistance to solvent uptake compared with unmodified NS and TEmNS, owing to stronger interfacial interactions and enhanced filler–rubber contact. At 10 phr, TAmNS decreased abrasion loss by 36% relative to the unfilled vulcanizate. Furthermore, at 6 phr loading, tensile strength and stress at 100% elongation were increased by ~ 112% and ~ 66%, respectively, albeit with a 33% reduction in elongation at break.</p>

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Mechanical Performance of Chlorinated EPDM/Chlorinated NBR Nanocomposites: Role of Bis[3-(Triethoxysilyl)Propyl] Tetrasulfide (TESPT)- and Thioctic Acid (TA)-Modified Nanosilica

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • S. Vishvanathperumal

摘要

This work focused on modifying the surface of nanosilica (NS) with two interfacial agents, namely bis[3-(triethoxysilyl)propyl] tetrasulfide (TESPT) and thioctic acid (TA). The resulting modified fillers—TESPT-modified nanosilica (TEmNS) and thioctic acid-modified nanosilica (TAmNS)—were incorporated into nanocomposites based on a chlorinated ethylene propylene diene monomer (Cl-EPDM) and chlorinated acrylonitrile butadiene rubber (Cl-NBR) blend. The influence of the fillers on key properties such as cure behavior, tensile strength, hardness, rebound resilience, and compression set was systematically examined. Complementary analyses encompassed swelling behavior, crosslink density, abrasion resistance, and fracture morphology using field emission scanning electron microscopy (FESEM). Among the investigated systems, TAmNS provided the most pronounced enhancements, improving tensile strength, stress at 100% elongation, tear strength, hardness, abrasion resistance, and curing performance. In particular, TAmNS-reinforced composites displayed superior resistance to solvent uptake compared with unmodified NS and TEmNS, owing to stronger interfacial interactions and enhanced filler–rubber contact. At 10 phr, TAmNS decreased abrasion loss by 36% relative to the unfilled vulcanizate. Furthermore, at 6 phr loading, tensile strength and stress at 100% elongation were increased by ~ 112% and ~ 66%, respectively, albeit with a 33% reduction in elongation at break.