Fabrication And Study On Calcium Copper Titanate/Polyimide Composite With High Dielectric Constant And High Temperature Resistance

Fast development of the electrical industry requires high dielectric materials for the embedded capacitor. The ceramic and polymer material cannot be able to meet the requirement of the embedded capacitors. To meet the requirement, a kind of composite combining advantages of both the ceramic and the polymer material was realized in this work.In this thesis, different kinds of method were used to synthesize the calcium copper titanate (CCTO) power, reported with the high dielectric constant, as the filler. Furthermore, because of the good high temperature resistance and the insulated property, polyimide (PI) was use as the matrix to fabricate the CCTO/PI composite. XRD, FTIR, SEM, TGA, and impedance analysis were used to characterize the CCTO/PI composite. The results showed the calcined CCTO can be used as the filler, and it dispersed well in the CCTO/PI composite. Filled with 40vol% CCTO, the dielectric constant of the composite reached 60 at 100Hz, which is 16 times larger than that of the PI. Furthermore, the dielectric constant of the composite got more large after its filler have been modified by KH550. The electrical property of the composite depended on the degree of its filler. TGA showed, its initial loss temperature was still as high as above 500℃.