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<p>Massive production and consumption of ground tire rubber (GTR) for transportation have led to significant waste rubber accumulation, posing a serious environmental threat. Rubber devulcanization technologies, as a promising strategy for rubber recycling, still face several challenges, including high consumption, pollution concerns. This study proposes an innovative method for rubber devulcanization using dielectric barrier discharge (DBD) plasma. Experimental results demonstrate a significant reduction in crosslink density, decreasing from 2.1 × 10<sup>−4</sup> mol/cm<sup>3</sup> to 0.8 × 10<sup>−4</sup> mol/cm<sup>3</sup>, after plasma treatment at a discharge voltage of 18&#xa0;kV for 30&#xa0;min. This reduction is accompanied by a decrease in gel content from 96.79 to 90.54%, indicating the effective cleavage of S-S and C-S bonds within GTR. Notably, after plasma treatment, the tensile strength and elongation at break of the regenerated rubber reached 10.2&#xa0;MPa and 357.7%, respectively, meeting the standards for high-grade rubber. These mechanical properties meet the standards for high-grade rubber, rendering the devulcanized rubber suitable for reuse in industrial manufacturing processes. However, when the discharge voltage surpasses a critical level, the electron energy attains a magnitude sufficient to cause extensive structural damage to the rubber backbone of GTR. Consequently, this degradation results in a significant reduction in the molecular weight of the regenerated GTR, which ultimately leads to a decrease in both tensile strength and elongation at break. Based on a comprehensive analysis of experimental data and characterization results, a plausible mechanism for plasma-assisted devulcanization is proposed, highlighting the significant potential to enhance environmental sustainability and support circular economy initiatives.</p>

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Plasma-Assisted Devulcanization of Waste Rubber Powder Using a Dielectric Barrier Discharge Reactor

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Nan Jiang,
  • Yubo Wang,
  • Ju Li,
  • Jie Li,
  • Zunrong Sheng,
  • Kefeng Shang,
  • Na Lu,
  • Zhihong Wang

摘要

Massive production and consumption of ground tire rubber (GTR) for transportation have led to significant waste rubber accumulation, posing a serious environmental threat. Rubber devulcanization technologies, as a promising strategy for rubber recycling, still face several challenges, including high consumption, pollution concerns. This study proposes an innovative method for rubber devulcanization using dielectric barrier discharge (DBD) plasma. Experimental results demonstrate a significant reduction in crosslink density, decreasing from 2.1 × 10−4 mol/cm3 to 0.8 × 10−4 mol/cm3, after plasma treatment at a discharge voltage of 18 kV for 30 min. This reduction is accompanied by a decrease in gel content from 96.79 to 90.54%, indicating the effective cleavage of S-S and C-S bonds within GTR. Notably, after plasma treatment, the tensile strength and elongation at break of the regenerated rubber reached 10.2 MPa and 357.7%, respectively, meeting the standards for high-grade rubber. These mechanical properties meet the standards for high-grade rubber, rendering the devulcanized rubber suitable for reuse in industrial manufacturing processes. However, when the discharge voltage surpasses a critical level, the electron energy attains a magnitude sufficient to cause extensive structural damage to the rubber backbone of GTR. Consequently, this degradation results in a significant reduction in the molecular weight of the regenerated GTR, which ultimately leads to a decrease in both tensile strength and elongation at break. Based on a comprehensive analysis of experimental data and characterization results, a plausible mechanism for plasma-assisted devulcanization is proposed, highlighting the significant potential to enhance environmental sustainability and support circular economy initiatives.