Effect Of Pei Nanofiber Membrane With Mwcnts On The Mechanical Properties Of Epoxy Composite

Epoxy resin has been the reseach focus of advanced composite materials as toughed and reinforced substrates. We can improve the properties of the composite through modifying epoxy matrix. Due to its inherent some excellent performance, carbon nanotubes has become an indispensable modified agent for reinforcing resin matrix. But because of the bad dispersion of un-chemical modification carbon nanotubes and the poor interface with resin matrix, which lead to that is a little difficult for carbon nanotubes to show its excellent mechanical properties. This paper puts forward to the method of polyetherimide (PEI) nano-fibrous membrane toughed epoxy resin matrix and composite doping multi-walled carbon nanotubes (MWCNTs). According to the introduction of chemical modification MWCNTs in nano-fibrous membrane, which makes good dispersion and orientation of MWCNTs in nano-fibrous membrane, so as to exert its excellent mechanical properties, then we can realize its toughed effect with low concentration of thermoplastic resin.We got the reaction activity of multi-walled carbon nanotubes (a-MWCNTs) through to the acidification and amino of un-modified MWCNTs (r-MWCNTs), as well as the reaction with butyl glycidyl ether (BGE).We studied the electrospinning of PEI nano-fibrous membrane technology, and confirmed process parameters of PEI nano-fibrous membrane preparation. Pure PEI nano-fibrous membrane was prepared at the very start, and PEI nano-fibrous membrane with r-MWCNTs and a-MWCNTs of different concentration were also prepared respectively. The micro-structure of PEI nano-fibrous membrane was investigated through SEM, which shows good orientation of PEI nano-fibers. What’s more, we also analyzed the orientation of MWCNTs in the nano-fibers through TEM and polarization Raman spectra, the results show that the a-MWCNTs are aligned along the fiber axis, the orientation in the PEI nano-fibers is better than the r-MWCNTs in the PEI nano-fibers, which is obviously improved.The epoxy resin (TDE-85) was toughed by using PEI nano-fibrous membrane of different concentration with r-MWCNTs and a-MWCNTs of different concentration. The tensile strength of epoxy is the highest with1.7wt%PEI nano-fibrous membrane, which is improved8.6%comparing with the tensile strength of PEI and epoxy blend system. The tensile strength of epoxy toughed by PEI nano-fibrous membrane with3wt％a-MWCNTs is improved6.4%comparing with PEI nao-fibrous membrane toughed epoxy system. The impact strength of epoxy toughed by1.7wt%PEI nano-fibrous membrane is enhanced14.1%comparing with the impact strength of pure epoxy system.T700carbon fiber/epoxy resin composite was toughed by PEI nano-fibrous membrane with a-MWCNTs of different concentration. We investigated the tensile strength, compressive strength, flexural strength and shear strength of the toughed composites, the results show that there are no obvious improvement for tensile strength and compressive strength comparing with the un-toughed composites, there are a little improvement for flexural strength and shear strength. The mode I fracture toughness (GIC) and mode II fracture toughness (GIIC) are obviously improved comparing with un-toughed composites. GIC of T700carbon fiber/epoxy composite toughed by PEI nano-fibrous membrane with3wt%a-MWCNTs is increased53.3%comparing with un-toughed composite, and GIIC of T700carbon fiber/epoxy composite toughed by pure PEI nano-fibrous membrane is increased74%comparing with un-toughed composite.