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Abstract <p>Phthalonitrile resin with elevated thermal resistance is crucial for high-speed aircraft functioning in high-temperature environments. Incorporating inorganic fillers with high melting points into phthalonitrile resin to improve its thermal and mechanical properties remains challenging, primarily due to the difficulty in forming a continuous inorganic protective phase that effectively enhances the thermal resistance. In this study, geometric shapes temperature-responsive filler blended phthalonitrile resin (SiBPh-KB) was prepared by incorporating 3-aminopropyltriethoxysilane (KH550)-modified nano-B<sub>2</sub>O<sub>3</sub> (K-B<sub>2</sub>O<sub>3</sub>) and low-melting point glass powder (K-BLF) into a phthalonitrile resin (SiBPh). This methodology successfully enhanced both the thermal and mechanical properties of the phthalonitrile resin and its composites. Simultaneously, issues of inorganic particle agglomeration and insufficient interfacial bonding were effectively mitigated. Additionally, the inhibitory effect of inorganic particles on the curing process of the resin matrix was diminished. Specifically, the resin (SiBPh-KB5) containing 10 wt.% K-B<sub>2</sub>O<sub>3</sub> and 2 wt.% K-BLF exhibited outstanding thermal stability (T<sub>d5</sub> = 558.1&#xa0;°C) and thermo-oxidative stability (T<sub>d5</sub> = 550.4&#xa0;°C), attributed to the construction of continuous B-Si inorganic protective phases in high temperatures. The quartz fiber-reinforced composite (QF/SiBPh-KB5) also displayed elevated flexural strength (651.6&#xa0;MPa). Especially after thermal aging at 500&#xa0;°C for 3&#xa0;h, the flexural strength of QF/SiBPh-KB5 was increased to 190.5&#xa0;MPa. The work provides an effective strategy for preparing phthalonitrile composites with excellent thermal and mechanical properties.</p> Graphical Abstract <p></p>

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In situ construction of B-Si protective phase via aminosiloxane-modified low-melting inorganic fillers to enhance thermal and mechanical properties of phthalonitrile

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Xiaotao Bai,
  • Lebing Lian,
  • Jinwen Xu,
  • Qi Lu,
  • Fengguang Jiang,
  • Qiujin Zhang,
  • Yuyao Yu,
  • Fang Wang,
  • Quan Zhou

摘要

Abstract

Phthalonitrile resin with elevated thermal resistance is crucial for high-speed aircraft functioning in high-temperature environments. Incorporating inorganic fillers with high melting points into phthalonitrile resin to improve its thermal and mechanical properties remains challenging, primarily due to the difficulty in forming a continuous inorganic protective phase that effectively enhances the thermal resistance. In this study, geometric shapes temperature-responsive filler blended phthalonitrile resin (SiBPh-KB) was prepared by incorporating 3-aminopropyltriethoxysilane (KH550)-modified nano-B2O3 (K-B2O3) and low-melting point glass powder (K-BLF) into a phthalonitrile resin (SiBPh). This methodology successfully enhanced both the thermal and mechanical properties of the phthalonitrile resin and its composites. Simultaneously, issues of inorganic particle agglomeration and insufficient interfacial bonding were effectively mitigated. Additionally, the inhibitory effect of inorganic particles on the curing process of the resin matrix was diminished. Specifically, the resin (SiBPh-KB5) containing 10 wt.% K-B2O3 and 2 wt.% K-BLF exhibited outstanding thermal stability (Td5 = 558.1 °C) and thermo-oxidative stability (Td5 = 550.4 °C), attributed to the construction of continuous B-Si inorganic protective phases in high temperatures. The quartz fiber-reinforced composite (QF/SiBPh-KB5) also displayed elevated flexural strength (651.6 MPa). Especially after thermal aging at 500 °C for 3 h, the flexural strength of QF/SiBPh-KB5 was increased to 190.5 MPa. The work provides an effective strategy for preparing phthalonitrile composites with excellent thermal and mechanical properties.

Graphical Abstract