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<p>Carbon nanotubes (CNTs) are regarded as promising nanofiber reinforcing materials for resin-based composites owing to their exceptional mechanical properties. However, uneven distribution and poor alignment of CNTs hinder the enhancement of mechanical properties in CNT composites. Additionally, conventional epoxy resin-based composites face challenges in maintaining stability in high-temperature environments. Herein, CNT/benzoxazine composite films with superior mechanical properties and heat resistance are developed using continuous CNT fibers as reinforcement and benzoxazine as the resin matrix. By optimizing resin content and CNT alignment for improved densification and interbonding, the well-designed composite films exhibit a tensile strength of 2.62 GPa, an elongation at break of 4.2%, and a Young’s modulus of 68 GPa. Furthermore, benefiting from the coupling effect between CNTs and the highly heat-resistant benzoxazine resin, the composite films demonstrate a high glass transition temperature of 240&#xa0;°C and achieve 90.6% strength retention at 200&#xa0;°C for over 10&#xa0;h (h). Thus, this study presents a novel approach for the development of CNT/resin composites characterized by lightweight, high strength, and excellent strength retention at elevated temperatures, suitable for applications in aerospace, automotive components, and various military and civil sectors.</p>

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Construction of aligned carbon nanotube/benzoxazine composite films with high mechanical properties and heat resistance

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Yiming Zhu,
  • Hongliang Shi,
  • Jinjin Ai,
  • Jiannong Wang

摘要

Carbon nanotubes (CNTs) are regarded as promising nanofiber reinforcing materials for resin-based composites owing to their exceptional mechanical properties. However, uneven distribution and poor alignment of CNTs hinder the enhancement of mechanical properties in CNT composites. Additionally, conventional epoxy resin-based composites face challenges in maintaining stability in high-temperature environments. Herein, CNT/benzoxazine composite films with superior mechanical properties and heat resistance are developed using continuous CNT fibers as reinforcement and benzoxazine as the resin matrix. By optimizing resin content and CNT alignment for improved densification and interbonding, the well-designed composite films exhibit a tensile strength of 2.62 GPa, an elongation at break of 4.2%, and a Young’s modulus of 68 GPa. Furthermore, benefiting from the coupling effect between CNTs and the highly heat-resistant benzoxazine resin, the composite films demonstrate a high glass transition temperature of 240 °C and achieve 90.6% strength retention at 200 °C for over 10 h (h). Thus, this study presents a novel approach for the development of CNT/resin composites characterized by lightweight, high strength, and excellent strength retention at elevated temperatures, suitable for applications in aerospace, automotive components, and various military and civil sectors.