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<p>In this work, the influence of chemical recycling on the structural integrity and mechanical performance of three-dimensional braided composites (3DBCs) based on vitrimer resin were experimentally investigated. Four different braiding angles were chosen to explore how braiding architecture governs the recyclability and secondary application potential of 3DBCs. A chemical recycling route using ethylene glycol as the recycling agent was implemented under atmospheric pressure at 160&#xa0;°C. Quasi-static mechanical tests were performed following ASTM standards to evaluate the mechanical properties of the composites in their as-fabricated and secondary-cured states. Furthermore, morphological observations were carried out on recovered preforms, and the mechanical responses of damaged zones and their adjacent regions after three-point bending tests were characterized. The experimental results reveal that braiding angle plays a dominant role in the structural retention of materials after recycling. Specimens with small braiding angles (10° and 20°) suffered severe yarn loosening and complete disruption of the continuous braided structure, while those with large braiding angles (30° and 40°) retained superior structural integrity. The 40° samples exhibited higher retention rates for compressive and bending properties, whereas the 30° samples achieved better performance retention under shear loading. Notably, the regions adjacent to damage zones in secondary-cured composites still possessed desirable mechanical capacities, which makes graded material reuse feasible. The present experimental methodology and research outcomes provide a solid basis for the secondary utilization of recovered three-dimensional braided carbon fiber preforms.</p>

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The Influence of Recycling on the Mechanical Properties of Vitrimer Resin-Based 3D Braided Composites

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Jingjing Liu,
  • Defang Zhao,
  • Ruixing Zhu,
  • Dacheng Fan,
  • Yue Chen,
  • Jingjing Dong,
  • Tao Liu

摘要

In this work, the influence of chemical recycling on the structural integrity and mechanical performance of three-dimensional braided composites (3DBCs) based on vitrimer resin were experimentally investigated. Four different braiding angles were chosen to explore how braiding architecture governs the recyclability and secondary application potential of 3DBCs. A chemical recycling route using ethylene glycol as the recycling agent was implemented under atmospheric pressure at 160 °C. Quasi-static mechanical tests were performed following ASTM standards to evaluate the mechanical properties of the composites in their as-fabricated and secondary-cured states. Furthermore, morphological observations were carried out on recovered preforms, and the mechanical responses of damaged zones and their adjacent regions after three-point bending tests were characterized. The experimental results reveal that braiding angle plays a dominant role in the structural retention of materials after recycling. Specimens with small braiding angles (10° and 20°) suffered severe yarn loosening and complete disruption of the continuous braided structure, while those with large braiding angles (30° and 40°) retained superior structural integrity. The 40° samples exhibited higher retention rates for compressive and bending properties, whereas the 30° samples achieved better performance retention under shear loading. Notably, the regions adjacent to damage zones in secondary-cured composites still possessed desirable mechanical capacities, which makes graded material reuse feasible. The present experimental methodology and research outcomes provide a solid basis for the secondary utilization of recovered three-dimensional braided carbon fiber preforms.