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<p>In this study, a novel rhodium nanocatalyst was developed through the immobilisation of rhodium nanoparticles onto multi-walled carbon nanotube substrates (Rh/MWCNTs), demonstrating high catalytic efficiency in the hydrogenation of styrene–butadiene rubber (SBR). The catalytic process led to the formation of a novel cyclic block rubber (CBR). The Rh/MWCNTs catalyst demonstrated exceptional activity, enabling the complete hydrogenation of both the aromatic benzene units and the aliphatic C = C bonds present in the SBR backbone. High-resolution transmission electron microscopy (HRTEM) confirmed the uniform dispersion and stable immobilisation of Rh nanoparticles across the MWCNTs surface. The catalyst’s excellent activity, coupled with its high stability and reusability, indicates its effectiveness in mitigating diffusion constraints and enhancing the interaction between catalytic sites and the polymer matrix. The successful conversion of SBR to fully hydrogenated CBR was corroborated by nuclear magnetic resonance (1H-NMR and 13C-NMR) and Fourier-transform infrared (FTIR) spectroscopy. Thermogravimetric analysis (TGA) revealed enhanced thermal stability of the synthesised CBR relative to the parent SBR. While a significant thermal degradation for SBR occurred at 360.5&#xa0;°C, CBR remained stable up to 409.2&#xa0;°C. Furthermore, differential scanning calorimetry (DSC) analysis showed that SBR had lower Tg values (− 45.1&#xa0;°C heating, – 54.9&#xa0;°C cooling), reflecting greater chain flexibility, whereas hydrogenated CBR exhibited higher Tg (− 33.4&#xa0;°C, − 34.4&#xa0;°C), confirming the enhanced thermal characteristics introduced by the hydrogenation process.</p>

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Enhanced catalytic hydrogenation of styrene-butadiene rubber via highly efficient and recyclable rhodium nanoparticles decorated multiwall carbon nanotubes

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Mustapha Sani Shehu,
  • Alaaddin M. M. Saeed,
  • Gui-Ping Cao,
  • Ahmed S. Al-Fatesh,
  • Salwa B. Alreshaidan,
  • Amal BaQais,
  • Qi-Jia Zhang,
  • Chun-Xue Wang,
  • Xin-Yi He

摘要

In this study, a novel rhodium nanocatalyst was developed through the immobilisation of rhodium nanoparticles onto multi-walled carbon nanotube substrates (Rh/MWCNTs), demonstrating high catalytic efficiency in the hydrogenation of styrene–butadiene rubber (SBR). The catalytic process led to the formation of a novel cyclic block rubber (CBR). The Rh/MWCNTs catalyst demonstrated exceptional activity, enabling the complete hydrogenation of both the aromatic benzene units and the aliphatic C = C bonds present in the SBR backbone. High-resolution transmission electron microscopy (HRTEM) confirmed the uniform dispersion and stable immobilisation of Rh nanoparticles across the MWCNTs surface. The catalyst’s excellent activity, coupled with its high stability and reusability, indicates its effectiveness in mitigating diffusion constraints and enhancing the interaction between catalytic sites and the polymer matrix. The successful conversion of SBR to fully hydrogenated CBR was corroborated by nuclear magnetic resonance (1H-NMR and 13C-NMR) and Fourier-transform infrared (FTIR) spectroscopy. Thermogravimetric analysis (TGA) revealed enhanced thermal stability of the synthesised CBR relative to the parent SBR. While a significant thermal degradation for SBR occurred at 360.5 °C, CBR remained stable up to 409.2 °C. Furthermore, differential scanning calorimetry (DSC) analysis showed that SBR had lower Tg values (− 45.1 °C heating, – 54.9 °C cooling), reflecting greater chain flexibility, whereas hydrogenated CBR exhibited higher Tg (− 33.4 °C, − 34.4 °C), confirming the enhanced thermal characteristics introduced by the hydrogenation process.