Impact strength and dielectric properties of epoxy resin modified by cyanate ester
To reduce preparation costs,low content of cyanate ester(CE)was used to enhance the toughness of the epoxy(EP)resin.EP/CE copolymer was prepared and the curing process was studied by differential scanning calorimeter and Fourier infrared spectrometer.The influence of CE on the impact strength of EP/CE copolymer was studied,as well as the flexural properties,dielec-tric properties and thermal properties.The results show that the EP/CE copolymer exhibits the best impact strength when the addi-tion of CE is 0.2 of epoxy resin,and the impact strength of the modified EP resin significantly increases from 3.46 kJ/m2 to 5.81 kJ/m2.In addition,the flexural modulus also significantly improves from 2.71 GPa to 3.47 GPa,and the dielectric loss angle tangent of 2～18 GHz frequency range at room temperature decreases to 0.029 8.The glass transition temperature and initial decomposition temperature decrease to 117.0℃ and 328.9℃,respectively.The EP/CE copolymer with good mechanical,dielectric and thermal properties can broaden the application of EP resin composites in mass production.
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