Enhancement of Both Ionic Conductivity and Permittivity of the High Polymer Film P(EO)n-CuBr2 under Hydrostatic Pressure (Ⅱ)－Application of Method to Add Plasticizer

Through the addition of different weights of non-aqueous CuBr2 to polyethylene oxide (molecular weight 5106), a series of high polymer film P(EO)n-CuBr2 (mole ratio n=[EO]/[Cu]=4, 8, 12, 16, 24) were prepared with the method of mixed solution and evaporation in vacuum. Their relative permittivity was measured in detail under hydrostatic pressure from 0.1 MPa to 2443 MPa. The effect of content of plasticizer (C4H6O3) on both ionic conductivity and permittivity at room temperature and under 1 atmosphere or high pressure were studied respectively. The experimental results show that the film P(EO)n-CuBr2 mingled with plasticizer C4H6O3 which possesses higher permittivity and extremely low intrinsic viscosity when the concentration nPC/ntotal=20%, not only has ionic conductivity at room temperature and under 1 atmosphere enhanced 6.8 times, but also has ionic conductivity under high pressure enhanced from one order of magnitude (under 0.1~100 MPa) to two orders of magnitude (under 250~800 MPa). The enhancement contributes greatly to the application of the film in high pressure state.