文献类型：期刊文献

英文题名：Preparation and Characterization of Cyano-Silicon-Containing Arylacetylene Resins and Their Composites: Dual Enhancement Strategy Involving Physical Interfacial Interactions and Chemical Crosslinking

作者：Jin, Chao-En[1];Zhu, Hua-Mei[1];Wang, Lei[1];Wang, Fan[1];Zhu, Ya-Ping[1];Deng, Shi-Feng[1];Qi, Hui-Min[1];Du, Lei[1]

机构：[1]East China Univ Sci Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tec, Minist Educ, Shanghai 200237, Peoples R China

年份：2024

卷号：42

期号：11

起止页码：1719

外文期刊名：CHINESE JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20243516933960);WOS:【SCI-EXPANDED(收录号:WOS:001297590900002)】；

基金：This work was financially supported by the Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, East China University of Science & Technology, and the Fundamental Research Funds for the Central Universities (Nos. 50321041918013 and 50321041917001).

语种：英文

外文关键词：Silicon-containing arylacetylene resins; Cyano group; Heat resistance; Composite interfaces; Mechanical properties

摘要：Silicon-containing arylacetylene (PSA) resins have broad application prospects because of their excellent heat resistance. However, improving their mechanical properties and interfacial bonding with reinforcement fibers while maintaining heat resistance is a challenge in engineering applications. Here, poly(diethynylbenzene-methylsilyl-3-benzonitrile) (DEB-CN) and poly(diethynylbenzene-methylsilyl-3,6-diethynylcarbazole-3-benzonitrile) (DEC-CN) were synthesized via an isopropylmagnesium chloride lithium-chloride complex (i-PrMgCl center dot LiCl), overcoming the compatibility problem between cyano groups and Grignard reagents. The cyano and alkyne groups in the resin underwent cyclization to form pyridine, catalyzed by the -NH- moiety in DEC-CN, resulting in extremely high thermal stability (5% weight loss temperature: 669.3 degrees C, glass transition temperature >650 degrees C). The combination of cyano dipole-dipole pairing and hydrogen bonding greatly enhanced the resin-fiber interface properties, while the generated pyridine promoted stress relief in the crosslinked network, substantially improving the mechanical properties of the cyano-silicon-containing arylacetylene resin composites. The flexural strength of quartz fiber cloth/DEC-CN composites was 298.2 MPa at room temperature and 145.9 MPa at 500 degrees C, corresponding to 84.0% and 127.6% enhancements, respectively, over the cyano-free counterpart. These cyano-silicon-containing arylacetylene resins exhibited a dual reinforcement mechanism involving physical interfacial interactions and chemical crosslinking, achieving a good balance between thermal stability and mechanical properties.