Influence of five kinds of coupling agents on dielectric properties of glass fiber/epoxy matrix composite was studied in this paper. The results show that after glass fiber is treated with coupling agents

surface free energy and wetting activation energy of glass fiber decrease

the reaction activity and wettability between glass fiber and epoxy resin can be improved. thus dielectric properties of glass fibre/epoxy matrix composite are improved

too. Influence of temperature and boiling time on dielectric properties of glass fiber/epoxy matrix composite was especially studied.With increase of temperature and boiling time

dielectric properties of glass fiber/wpoxy matrix composite have obviously changed

which was attributed to the polarity and chemical structure of coupling agents

decrease of voids of composite and change of interface polarization intensity.