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<p>Polysulfides produced by inverse vulcanization of elemental sulfur (S) with multi-functional alkenes are promising for applications in rubber nanocomposites. Herein we carried out inverse vulcanization of S using liquid isoprene rubber (LIR) as the crosslinker and <i>N</i>-cyclohexyl-2-benzothiazolesulfenamide (CZ) as promoter and investigate the effects of the inversely vulcanized S/CZ/LIR mixtures on the crosslinking networks and carbon black (CB) dispersity of CB filled isoprene rubber (IR) vulcanizates. It is shown that the S/CZ/LIR mixtures could promote the IR vulcanization, improve the dispersity of CB significantly and lower loss modulus in the linear viscoelastic region for gums vulcanizates. The gums vulcanizates with an extra addition of 1 phr S/CZ/LIR mixtures exhibit more homogeneous crosslinking networks with smaller mesh sizes, higher tensile strengths in comparison with the control one. Furthermore, the S/CZ/LIR mixtures significantly improve the thermo-oxidative aging resistance. The deformation of nanocomposites vulcanizates mainly involves the matrix experiencing locally amplified deformation while the S/CZ/LIR mixtures slightly influence the strain-induced crystallization of the network strands. This work provides valuable insights for modulation of the crosslinking network and filler dispersity to prepare high strength, low dissipation rubber products.</p>

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Mediation of crosslinking network and filler dispersity towards high-performance isoprene rubber/carbon black nanocomposites by liquid isoprene rubber inversely vulcanized sulfur

  • 期刊论文

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  • 发表日期：

    2026年4月6日

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  • Benteng Liu,
  • Hongda Meng,
  • Qiao Li,
  • Ziye Liu,
  • Min Zuo,
  • Miao Du,
  • Yihu Song,
  • Qiang Zheng

摘要

Polysulfides produced by inverse vulcanization of elemental sulfur (S) with multi-functional alkenes are promising for applications in rubber nanocomposites. Herein we carried out inverse vulcanization of S using liquid isoprene rubber (LIR) as the crosslinker and N-cyclohexyl-2-benzothiazolesulfenamide (CZ) as promoter and investigate the effects of the inversely vulcanized S/CZ/LIR mixtures on the crosslinking networks and carbon black (CB) dispersity of CB filled isoprene rubber (IR) vulcanizates. It is shown that the S/CZ/LIR mixtures could promote the IR vulcanization, improve the dispersity of CB significantly and lower loss modulus in the linear viscoelastic region for gums vulcanizates. The gums vulcanizates with an extra addition of 1 phr S/CZ/LIR mixtures exhibit more homogeneous crosslinking networks with smaller mesh sizes, higher tensile strengths in comparison with the control one. Furthermore, the S/CZ/LIR mixtures significantly improve the thermo-oxidative aging resistance. The deformation of nanocomposites vulcanizates mainly involves the matrix experiencing locally amplified deformation while the S/CZ/LIR mixtures slightly influence the strain-induced crystallization of the network strands. This work provides valuable insights for modulation of the crosslinking network and filler dispersity to prepare high strength, low dissipation rubber products.