Structure Performance Study Of Carbon Fiber/Epoxy Resin Composite Laminate After And Berore Being Modified

Mass application of composite material (fibre reinforced composite material) in modern large-scale civil aircraft is one of it’s remarkable features. Composite preparation from prepreg is getting more attention from relevant researchers as one of composite preparing methods being developed rapidly since the advantage of high strength、hardness, impact resistance、light weight and manageable forming process etc. Prepreg977-2、M21with excellent performance have achieved actual applications being used autoclave forming.Irda and XPS Test of HT-1、977-2and M21prepreg have been done. Irda Test shows that they have the similar chemical structure, all contain Bisphenol-A epoxy resins and amine curing agent. XPS shows that the main elements have the same chemical bonding state and it’s concluded the functional groups are located in the consistent chemical construction atmosphere, so that there was so little difference between the primary structures in these three resin systems. Shear strength Flexural Strength and Modulus、Glass-transition temperature in dry and hygroscopic state of the composites are respectively compared. Scanning electron micrograph、XPS analysis of elements characteristics and main physical and chemical properties have proved the possible factors in property differences. current status of the domestic prepreg are also been stated.T700/HT-1composites own excellent properties. Shear strength etc. have reached a high level even surpassed M21and977-2which are widely used in aviation overseas. However, the interlaminar fracture toughness and impact resistance etc. even have a lage room for improvement. Therefore Polyetherimide (PEI) nano-fibrous membranes with3%active multiwalled carbon nanotubes (a-MWCNTs) are used between prepreg tapes to improve the mechanical properties of T700/HT-1composites further and enlarge the field of application in probability. PEI acts as a kind of medium bringing a-MWCNTs in the composites in order and uniformly to achieve multi-scale reinforcing. As the content of MWCNTs/PEI nano-fibrous membrans in resin reaches6.7%, Impact stress of T700/HT-1composite increases by8.9%and Flexural strength in direction0°and90°increases respectively by7.12%and8.03%. Compression strength in direction0°and90°also increases respectively by31.08%and15.12%with4.5%and2.2%MWCNTs/PEI nano-fibrous membrans respectively. Impact stress and mechanical properties horizontally of the composites have improved with a appropriate amount of MWCNTs/PEI nano-fibrous membrans and have a better effect than the ones modified by PEI fibrous membrans. We attribute the improvement to the PEI nanoparticles distributing uniformity and widely in the composites and the function of a-MWCNTs interlinking carbon fiber and epoxy resin in composite.