Influence of Liquid Isoprene Rubber on Strain Softening of Carbon Black Filled Isoprene Rubber Nanocomposites

Abstract

The reinforcement of rubbers by nanoparticles is always accompanied with enhanced dissipation of mechanical energy upon large deformations. Methods for solving the contradiction between improving reinforcement and reducing energy dissipation for rubber nanocomposites have not been well developed. Herein carbon black (CB) filled isoprene rubber (IR)/liquid isoprene rubber (LR) blend nanocomposites with similar crosslink density (ve) are prepared and influence of LR on the strain softening behaviors including Payne effect under large amplitude shear deformation and Mullins effect under cyclic uniaxial deformation is investigated. The introduction of LR could improve the frequency sensitivity of loss modulus and reduce critical strain amplitude for Payne effect and loss modulus at the low amplitudes. Meanwhile, tuning ve and LR content allows reducing mechanical hysteresis in Mullins effect without significant impact on the mechanical performances. The investigation is illuminating for manufacturing nanocomposite vulcanizates with balanced mechanical hysteresis and reinforcement effect.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. U1908221, 51873190 and 51790503) and the Fundamental Research Funds for the Central Universities (No. 2020XZZX002-08).

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Correspondence to Yi-Hu Song.

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Hou, FY., Song, YH. & Zheng, Q. Influence of Liquid Isoprene Rubber on Strain Softening of Carbon Black Filled Isoprene Rubber Nanocomposites. Chin J Polym Sci (2021). https://doi.org/10.1007/s10118-021-2550-y

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Keywords

  • Rubber nanocomposites
  • Stress softening
  • Mechanical hysteresis
  • Liquid rubber