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<p>To address the poor mechanical properties of polydimethylsiloxane (PDMS) and enhance the understanding of the reinforcement mechanisms of aerogel network structures in rubber matrices, this study reinforced PDMS using an ordered interconnected three-dimensional montmorillonite (MMT) aerogel network. The average pore diameter of the aerogels was successfully reduced from 11.53 µm to 2.51 µm by adjusting the ratio of poly(vinyl alcohol) (PVA) to MMT <i>via</i> directional freezing. Changes in the aerogel network were observed in field emission scanning electron microscope (FESEM) images. After vacuum impregnation, the aerogel network structure of the composites was observed using FESEM. Tensile tests indicated that as the pore diameter decreased, the elongation at break of the composites first increased to a peak of 329.61% before decreasing, while the tensile strength and Young’s modulus continuously increased to their maximum values of 6.29 MPa and 24.67 MPa, respectively. Meanwhile, FESEM images of the tensile cracks and fracture surfaces showed that with a reduction in aerogel pore diameter, the degrees of crack deflection and interfacial debonding increased, presenting a rougher fracture surface. These phenomena enable the composites to dissipate substantial energy during tension, thus effectively improving the mechanical strength of the composites. The present work elucidates the bearing of ordered three-dimensional aerogel network structures on the performance of rubber matrices and provides crucial theoretical insights and technical guidance for the creation and optimization of high-performance PDMS-based composites.</p>

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High-performance Polydimethylsiloxane Composites Based on Ordered Three-dimensional PVA-MMT Aerogel Network: Network Structure Regulation and Mechanical Enhancement Mechanism

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Zhe-Yu Yang,
  • Long-Jin Huang,
  • Zhao-Qun Shao,
  • Yang Yang,
  • Xia-Yan Cao,
  • Zi-Han Wang,
  • Sheng Cui,
  • Chun-Hua Zhu,
  • Yu Liu

摘要

To address the poor mechanical properties of polydimethylsiloxane (PDMS) and enhance the understanding of the reinforcement mechanisms of aerogel network structures in rubber matrices, this study reinforced PDMS using an ordered interconnected three-dimensional montmorillonite (MMT) aerogel network. The average pore diameter of the aerogels was successfully reduced from 11.53 µm to 2.51 µm by adjusting the ratio of poly(vinyl alcohol) (PVA) to MMT via directional freezing. Changes in the aerogel network were observed in field emission scanning electron microscope (FESEM) images. After vacuum impregnation, the aerogel network structure of the composites was observed using FESEM. Tensile tests indicated that as the pore diameter decreased, the elongation at break of the composites first increased to a peak of 329.61% before decreasing, while the tensile strength and Young’s modulus continuously increased to their maximum values of 6.29 MPa and 24.67 MPa, respectively. Meanwhile, FESEM images of the tensile cracks and fracture surfaces showed that with a reduction in aerogel pore diameter, the degrees of crack deflection and interfacial debonding increased, presenting a rougher fracture surface. These phenomena enable the composites to dissipate substantial energy during tension, thus effectively improving the mechanical strength of the composites. The present work elucidates the bearing of ordered three-dimensional aerogel network structures on the performance of rubber matrices and provides crucial theoretical insights and technical guidance for the creation and optimization of high-performance PDMS-based composites.