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Preparation and Characterization of Cyano-silicon-containing arylacetylene resins and Their Composites:Dual Enhancement Strategy Involving Physical Interfacial Interactions and Chemical Crosslinking

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Chinese Journal of Polymer Science 2024年第11期42卷 1719-1729,I0009页

作者： Chao-En Jin Hua-Mei Zhu Lei Wang Fan Wang Ya-Ping Zhu Shi-Feng Deng Hui-Min Qi Lei Du Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education School of Materials Science and EngineeringEast China University of Science&TechnologyShanghai200237China

silicon-containing arylacetylene (PSA) resins have broad application prospects because of their excellent heat ***,improving their mechanical properties and interfacial bonding with reinforcement fibers while maintaining heat resistance is a challenge in engineering ***,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 *** 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 *** 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 *** 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

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