| Continuous fiber-reinforced resin-based composite materials are a class of structural materials that can replace metals and wood.They have the advantages of light weight,good heat resistance,corrosion resistance,and easy processing and molding.They are widely used in sports,automobiles,electronics,and aerospace and other fields.In recent years,research and development of high-performance thermoplastic resin-based fiber-reinforced composite materials have become particularly important due to higher requirements for impact damage tolerance,product design freedom,and environmentally friendly recyclability.Polyaryl ether nitrile(PEN)is a polymer compound with a large number of benzene rings and strong polar nitrile groups in the molecular chain.It has the characteristics of high strength,high modulus,high thermal stability,and good flame retardancy.Because bisphenol A type PEN has both good solution processability and good melt processability,it was selected as the thermoplastic resin matrix,combined with outstanding performance and low cost continuous glass fiber(GF),using pre-impregnation combined with hot pressing The molding process prepares continuous fiber reinforced polyarylethernitrile composite materials.The main research contents are summarized as follows:Pre-impregnate the pre-treated GF with dilute PEN solution to obtain the PEN/GF initial prepreg after drying.At the same time,the PEN film with a uniform thickness is prepared by the casting film method,the PEN film and the initial prepreg are laminated and laminated,and the PEN/GF composite laminate is prepared by hot press molding.Explore the impact of molding process conditions on the performance of composite laminates.Specifically,the composite laminates are monitored by testing and characterizing the cross-sectional morphology,macroscopic mechanical properties and dynamic thermomechanical strength.While defining the key factors affecting the performance of continuous fiber reinforced PEN composites,determine the molding process conditions.Subsequently,technically introduced functional nanoparticles(nanobarium titanate particles(BT)),combined with the above process conditions to prepare PEN/BT/GF composite materials with different nanoparticle content.Use the"micro-nano combination"effect to improve the stress transmission mode of the composite material under load and improve its macro-mechanical strength;meanwhile,by means of the secondary dispersion mechanism of nanoparticles,improve the interface bonding between the resin matrix and the fiber,improve the structural strength and comprehensive performance of composite materials.Through mechanical testing,it was found that with the increase of BT content,the bending strength of the composite material gradually increased.When the BT content is 10 wt%,its modulus is as high as 19.5 GPa,and the glass transition temperature(T_g)can be maintained at 185-190 ~oC has very excellent thermal stability.Moreover,the addition of BT increases the dielectric constant of the composite material,reduces the dielectric loss,and provides basic data for achieving the structure-function integration of the composite material.In order to further improve the dispersibility and stability of nanoparticles in the thermoplastic resin matrix,this work uses chemical grafting to modify the surface of BT to obtain BT@CN particles.It is then introduced into the continuous fiber reinforced PEN composite system by secondary dispersion.The thermal stability and mechanical strength of the composite materials were evaluated.The results show that the modified nanoparticles are induced to enhance the interfacial adhesion between the thermoplastic resin matrix and the continuous fibers by improving the interfacial compatibility between the reinforcing particles and the resin matrix,which has significantly improved the overall performance of the composite system.At the same time,the effect of the addition amount of modified nanoparticles on the performance of the composite system is also obvious. |
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