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

作　　者：Chao-En Jin Hua-Mei Zhu Lei Wang Fan Wang Ya-Ping Zhu Shi-Feng Deng Hui-Min Qi Lei Du 

机构地区：[1]Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education,School of Materials Science and Engineering,East China University of Science&Technology,Shanghai,200237,China

出　　处：《Chinese Journal of Polymer Science》2024年第11期1719-1729,I0009,共12页高分子科学（英文版）

基　　金：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)。

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·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°C,glass transition temperature>650°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°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.

关 键 词：Silicon-containing arylacetylene resins Cyano group Heat resistance Composite interfaces Mechanical properties 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业] TB332[一般工业技术—材料科学与工程]