文献类型：期刊文献

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

作者：Bai, Xiaotao[1];Lian, Lebing[1];Xu, Jinwen[1];Lu, Qi[2];Jiang, Fengguang[1];Zhang, Qiujin[1];Yu, Yuyao[1];Wang, Fang[1];Zhou, Quan[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[2]Zhejiang ChenNuo Polymer Inc Co Ltd, Jiaxing 314204, Peoples R China

年份：2025

卷号：60

期号：21

起止页码：8734

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20252218522788);WOS:【SCI-EXPANDED(收录号:WOS:001494961200001)】；

基金：This work was supported by the National Natural Science Foundation of China (No.52173074, 52473075); and the Fundamental Research Funds for the Central Universities (No. JKD01251701).

语种：英文

外文关键词：Phthalonitrile resin; Inorganic fillers; Surface modification; High-temperature resistance

摘要：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 (T-d5 = 558.1 degrees C) and thermo-oxidative stability (T-d5 = 550.4 degrees 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 degrees 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.