EFFECT OF CHEMICAL TREATMENT ON DIELECTRIC BEHAVIOUR OF BFRE COMPOSITES

摘要

The studies on the influence of chemical modification on the dielectric behaviour of bamboofiber reinforced epoxy (BFRE) composites have been carried out. The woven bamboo mats havebeen modified by treatment with sodium hydroxide (alkali treatment), silane coupling agents,acrylonitrile, methacrylamide, dicumyl peroxide, acrylic acid. The dielectric properties of thecomposites were characterized using standard impedance analyzer in the frequency range from95Hz-2MHz at room temperature. Chemical treatment of bamboo fiber mats resulted in decreaseof dielectric constant, dissipation factor and ac conductivity of BFRE composites due to decreasein orientation polarization by the reduction of hydophilicity as compared to untreated one.Minimum value of dielectric constant and ac conductivity was observed for silane treated BFREcomposites. Volume resistivity of BFRE composites increased with chemical treatments. Thevalue of dielectric dissipiation factor, dielectric constant and volume resistivity decreased withincreasing frequency. Results obtained have been analyzed to understand the insulating behaviorof bamboo composites.