Research On Toughing Epoxy And Composite With Different Shape Nanoparticles

This paper overviews the purpose,significance and mechanism of epoxy and composite with different shape nanoparticles.It has introduced toughening technology on the modification of epoxy resin and nanoparticles toughened epoxy resin of progress.This experiment adopts mixture thick sour and plasma to oxidize carbon nanofiber which can carry on a surface modification. Based on that, some function regiment which will shape stronger chemical bond with resin matrix can be introduced to the surface of carbon fiber. It will improve the dispersion of carbon nanofiber in resin matrix.At the same time,that will enhance the combining strength of carbon nanofiber and resin matrix.It discusses the preparation of nanoparticle/epoxy resin and nanoparticle/fiberglass/epoxy resin composites.The influence in mechanical and rheological property of epoxy resin composites has been analyzed because of the addition of nano-montmorillonite, untreated carbon nanofiber, acided and plasma treated carbon nanofiber and core shell rubber.The study indicates that the property of tensile,impact,fracture toughness and dynamic mechanical can be improved because of the addition of nano-montmorillonite, carbon nanofiber and core shell rubber.That's to say that some effect of reforting and thoughing can be displayed.When the addition of carbon nanofiber is only 0.1wt%,tensile and impact intensity of composite can be increased by 3.5% and 15% respectively.When the addition of carbon nanofiber reach to 0.2wt%, composite will have best mechanical property,toughness can be increased by 13.8%.When the addition of nano-montmorillonite is 2wt%,tensile intensity, impact intensity,toughness can be increased by 67%,57%,33% respectively.When the addition of core shell rubber is 10wt%,tensile intensity, impact intensity can be increased by 46.4%,20% respectively.But toughness can reach to max,when the addition of core shell rubber is only 2wt%.Concentrated acidification(vitriol/nitric acid, 1:3) and plasma oxidation technology could reduce tangling degree of the CNFs,decrease the quantities of the residual catalyst particles and impurities, and introduce a mount of hydroxyl and carboxyl functional groups onto the surface of CNFs, which benefits to disperse them into the matrix and enhance the interface bonding between the carbon nanofibers and matrix. As a result, the critical fracture toughness factors of composites were greatly improved. When the CNFs content was 0.5wt%, the toughness of the composite containing plasma oxidation treated CNFs was improved by 44.6% compared with that of pure epoxy resin, and by 25.3% compared with that of untreated CNFs/epoxy composites.Nano-montmorillonite and carbon nanofiber exhibited synergistic improving on the critical stress intensity factor of the pure epoxy.The fracture surface micrographs prove that micro-cracks, cavities and fiber pull-outare responsible for improving the toughness of CNFs-NMMT/epoxy resin composites.However,when the addition content of nanoparticles is too high,all property will lower to be worse than blank sample. Otherwise,glass transition temperature will be increased because of the addition of nanoparticles.Only damping property of expoy resin with nano-montmorillonite can be improved.