文献类型：期刊文献

英文题名：Preparation and properties of a novel silicon- and alkynyl-containing phthalonitrile resin with enhanced processability and thermal stability

作者：Hu, Jianke[1];Guan, Yichen[1];Liu, Xiwei[1];Wang, Yitian[1];Guo, Yun[1,2,3];Hu, Yanhong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tecn, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Res Inst Ind Catalysis, Sch Chem & Mol Engn, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai, Peoples R China;[3]Fudan Univ, State Key Lab Mol Engn Polymers, Shanghai, Peoples R China

年份：2026

卷号：38

期号：1

起止页码：66

外文期刊名：HIGH PERFORMANCE POLYMERS

收录：;EI(收录号：20253719131673);WOS:【SCI-EXPANDED(收录号:WOS:001566470400001)】；

基金：The authors disclosed receipt of the followingfinancial support forthe research, authorship, and/or publication of this article: Thiswork was supported by the Fundamental Research Funds for the Central Universities (JKD01251701), and the Open foundation of State Key Laboratory of Molecular Engineering of Polymers (Fudan University, NO. K2023-25).

语种：英文

外文关键词：Phthalonitrile resin; resin matrix composite; silicon; internal alkynyl; thermal stability

摘要：To expand the application of phthalonitrile resins in high-temperature environments, we designed and synthesized a novel phthalonitrile monomer (SiBEPN) containing both silicon and internal alkynyl groups, along with its silicon-free counterpart (DEBPN). The structural characterizations of both SiBEPN and DEBPN monomers were conducted using 1H nuclear magnetic resonance (1H NMR), Fourier transform infrared spectroscopy (FTIR) and mass spectrometry (MS). SiBEPN demonstrated significantly lower melting point and higher solubility compared to DEBPN. Their curing behaviours were systematically investigated via differential scanning calorimetry (DSC) and FTIR analysis, while the processability was evaluated by rheological tests. Thermal properties were analyzed using thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA), revealing excellent thermal stability for both cured resins. The 5% weight loss temperatures (Td5) of p-SiBEPN and p-DEBPN with DDS reached 530 degrees C and 569 degrees C in N2, respectively, with glass transition temperatures (Tg) exceeding 450 degrees C. Furthermore, quartz fiber reinforced SiBEPN (QF/p-SiBEPN) composites exhibited superior mechanical properties compared to QF/p-DEBPN at all tested temperatures. The room-temperature flexural strength and interlaminar shear strength of QF/p-SiBEPN were 338.32 MPa and 24.30 MPa, respectively. Notably, these composites maintained 62.1% and 57.3% of their initial strengths at 500 degrees C, demonstrating outstanding high-temperature performance.