Enhancement of Both Ionic Conductivity and Permittivity of the High Polymer Film P(EO)n-CuBr2 under Hydrostatic Pressure (Ⅰ)－Discovery of Pressure Effects of Three Different Phases
-
摘要: 用混溶蒸发法制备出一系列高聚物P(EO)n-CuBr2（n=4, 8, 12, 16, 24）薄膜，并详细测量它们在0.1～350 MPa静水压范围内的复阻抗谱、在0.1～2 400 MPa静水压范围内的交流电导率以及介电常数。结果表明：离子电导率对压力的依赖关系（-p曲线）是条折线，可分解为四条直线相迭加。进一步做X射线衍射物相分析，它们分别归于PEO非晶相的压力效应、PEO结晶相的压力效应和析出CuBr2新相的压力效应。由此计算出上述三种不同相所对应的激活体积、截止压力各自随高聚物P(EO)n-CuBr2薄膜组分的变化。为减小离子电导率的压力效应提供了物理基础。Abstract: With the addition of different weight of CuBr2 (ratio n =[EO]/[Cu]=4, 8, 12, 16, 24) to polyethylene oxide (molecular weight 5106), a series of high polymer ionic conductors P(EO)n-CuBr2 were prepared. Both complex impedance spectra of samples in the hydrostatic pressure range from 0.1 to 350 MPa and alternating current conductivity of samples in the pressure range from 0.1 to 2 400 MPa were measured in detail. Results show that the pressure dependence of conductivity can be decomposed into four linear parts. According to the phase analysis from X-ray diffraction patterns, it is found that three of the four straight lines correspond to the pressure effects of the amorphous phase of PEO, the crystalline phase of PEO, and the new phase of CuBr2. Hence, the composition dependence of the corresponding activation volume and cutoff pressure of the three types of conductivity-pressure effects can be calculated.
-
Hu C P, Wright P V. Ionic Conductivity of Unsaturated Polyester Resin Networks Containing LiC 104 [J]. British Polymer J, 1989, 2l(5): 421-427. Chiang C K, Bauer B J, Briber R M, et al. Systhesis of Ionic Conducting Interpenetrating Polymer Networks [J]. Polymer Commu, 1987, 28(2): 34-35. Li Guang-yuan, Wang Xiao-yan, Wang Xiu-fang, et al. Effect of Pressure on Electric Conductivity of High Polymer Ionic Conductor of Type INP [A]. Digests of the 6th National Conference on Solid State Ionics [C]. Fuzhou, China, 1992: 161-164. (in Chinese) Su Fang, Che Rong-zheng, Xu Wei, et al. Measurement and Analysis of Strain and Calibration of Pressure in Piston-Cylinder Type Apparatus with 4.5 GPa Hydrostatic Pressure [J]. Chinese Journal of High Pressure Physics, 1990, 4(1): 63-71. Xu J, et al. Handbook of Mechanical Design [M]. Beijing: Mechanical Industry Press, 1991, Vol. 1, 4-55. Fan tian xiu yi, et al. Handbook of Usual Parameter on Physics [M]. Beijing: Science Press, 1979: 77. Xue Rong-jian, Yao Yu-shu, Zhao Zong-yuan, et al. Study of Ionic Conductance of Fast Ionic Conductor Rb4Cul6I7C113 under Hydrostatic Pressure [J]. Acta Physica Sinica, 1982, 31: 810. Li Fu-cai. Structure and Physical Properties of High Polymer [M]. Beijing: Science Press, 1989: 258. -
点击查看大图
计量
- 文章访问数: 7289
- HTML全文浏览量: 469
- PDF下载量: 726
下载:
