Preparation And Characterization Of Epoxy-based Blends Including BMG And MWCNTs

Epoxy resin(EP)is widely used in aviation,aerospace,electronics,electrical appliances,automobiles,machinery and other fields due to their good mechanical properties,chemical resistance and electrical insulation.However,the brittleness and poor impact resistance of neat epoxy network has limited their application.In this paper,an ABA-type block copolymers(BMG)was synthetized by atom transfer radical polymerization.The BMG was used as the toughening agents to improve the toughness of epoxy network.In addition,multi-walled carbon nanotubes were treated using oxidation of strong acid to prepare DEGBA/BMG/MWCNTs composites.The chemical structure and composition of the BMG was studied by NMR,FTIR,XPS and GPC.In comparison of the curing kinetics,mechanical properties,heat resistance,rheological properties,electrical conductivity,thermal conductivity and micromorphology to investigate the difference of the DEBGA/BMG network,DEBGA/MWCNTs network,and DEBGA/BMG/MWCNTs composites.The specific research contents are as follows:(1)A methyl methacrylate glycidyl ester copolymer is grafted on both ends of the acrylate by atom transfer radical polymerization.The soft segment structure can effectively improve the toughness of the resin matrix,and the hard segment structure can reduce the decrease of the mechanical strength of the resin matrix.The results show that the toughness of DGEBA/BMG blend is optimal with the addition of 10 phr BMG The impact strength reached 19.8 kJ/m2.But the tensile strength and flexural strength were significantly reduced.(2)The surface treatment of multi-walled carbon nanotubes was carried out by strong acid oxidation method,and the effects of carbon nanotubes before and after acidification on the properties of epoxy resin were studied.The results show that the surface of the MWCNTs formed tydroxyl and carboxyl functional groups,which improved the dispersibility of MWCNTs.Therefore,the mechanical strength,heat resistance,electrical conductivity and thermal properties of DGEBA/MWCNTs network were improved.(3)The DEGBA/BMG/MWCNTs composites were prepared by using hot melt blending.The results show that the performance of performance of is best optimal with the addition of 10 phr BMG and 0.5 phr acid-treated MWCNTs.