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<p>Due to its versatile properties, epoxy resin is widely utilized in industrial applications such as laminated circuit boards, electronic encapsulation, surface coatings, and adhesives. However, its implementation in high-performance scenarios remains constrained by inherent brittle behavior, low impact resistance, and poor fracture toughness. In this study, coniferous wood fibers were functionalized via a synergistic process of mechanical pulping and hydrophobic modification using 3-aminopropyltriethoxysilane (APTES). A cellulose/epoxy composite system was subsequently developed to optimize synergistic performance. The effects of fiber pulping intensity and additive content on the mechanical properties and thermal stability were systematically investigated. Experimental results revealed that APTES-modified cellulose significantly enhanced the interfacial bonding strength, resulting in a 314% increase in shear strength (from 954 to 3949 N). Furthermore, the impact resistance improved from 36.75 to 40.23&#xa0;kJ/m<sup>2</sup>, and the flexural modulus rose from 17.7 to 31.4&#xa0;MPa, confirming efficient stress transfer through the fiber reinforcement. Notably, silanization endowed the composites with superior environmental durability: shear strength at − 20&#xa0;°C and under water immersion increased by 132% (to 4597 N) and 172% (to 2563 N), respectively. This work provides an innovative strategy for fabricating sustainable, high-performance epoxy-based composites and expands the high-value utilization of cellulose in advanced materials.</p>

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Effect of Hydrophobic Modification of Cellulose on the Mechanical Properties of Cellulose Epoxy Resin Composites

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Xinyue Zhang,
  • Yike Wang,
  • Guangwei Sun,
  • Yao Li

摘要

Due to its versatile properties, epoxy resin is widely utilized in industrial applications such as laminated circuit boards, electronic encapsulation, surface coatings, and adhesives. However, its implementation in high-performance scenarios remains constrained by inherent brittle behavior, low impact resistance, and poor fracture toughness. In this study, coniferous wood fibers were functionalized via a synergistic process of mechanical pulping and hydrophobic modification using 3-aminopropyltriethoxysilane (APTES). A cellulose/epoxy composite system was subsequently developed to optimize synergistic performance. The effects of fiber pulping intensity and additive content on the mechanical properties and thermal stability were systematically investigated. Experimental results revealed that APTES-modified cellulose significantly enhanced the interfacial bonding strength, resulting in a 314% increase in shear strength (from 954 to 3949 N). Furthermore, the impact resistance improved from 36.75 to 40.23 kJ/m2, and the flexural modulus rose from 17.7 to 31.4 MPa, confirming efficient stress transfer through the fiber reinforcement. Notably, silanization endowed the composites with superior environmental durability: shear strength at − 20 °C and under water immersion increased by 132% (to 4597 N) and 172% (to 2563 N), respectively. This work provides an innovative strategy for fabricating sustainable, high-performance epoxy-based composites and expands the high-value utilization of cellulose in advanced materials.