高聚物(PEO)n-CuBr2薄膜在流体静高压下的离子导电性

用混溶蒸发法制备出高聚物（ＰＥＯ）_n－ＣｕＢｒ₂（ｎ＝４，８，１２，１６，２４）薄膜。并详细测量它们在０．１－３５０ＭＰａ静水压范围的复阻抗谱，以及在０．１－２４００ＭＰａ静水压范围的交流电导率。结果表明：离子电导率与压力的依赖关系可分解为四段相迭加的线性关系。根据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新相ＣｕＢｒ₂的压力效应。最后给出克服办法——添加少量增塑剂碳酸乙烯酯可增加（ＰＥＯ）_n－ＣｕＢｒ₂薄膜的弹性，使压力下的离子电导率提高一至两个数量级。关键词：

IONIC CONDUCTIVITY UNDER HIGH HYDRO-STATIC PRESSURE IN HIGH POLYMER THIN FILM (PEO)n-CuBr2

WE used polyethylene oxide (molecular weight =5×10⁶), with addition of diffcrent weight of ＣｕＢｒ₂ (ratio n=[EO]/[Cu]= 4，8，12，16,24), to prepare a series of high polymer ionic conductor （ＰＥＯ）_n－ＣｕＢｒ₂. Their complex impedance spectra in the high hydrostatic pressure range of 0.1-350 MPa and alternating conductivity in the pressure range of 0.1-2400MPa were measured. Results show that pressure dependence of conductivity can be decomposed into four saperimposed linear dependences components. According to phase analysis of X-ray diffraction curve, these straight lines respectively belong to pressure effect of amorphous phase of PEO，pressure effect of crystalline phase of PEO and pressure effect of new phase CuBr₂. Hence the relation between compositiod n and activation volume, limit pressure of the three types of conductivity-pressure effect were calculated. Finally we found that by adding a small amount of plasticizers, C₄H₆O₃, can increase elasticity of high polymer film （ＰＥＯ）_n－ＣｕＢｒ₂ and enhance its ionic conductivity under high pressure one or two order of magnitude.