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用正电子湮设方法研究了高分子固体电解质聚醚聚氨酯（ＰＥＵ）在与ＬｉＣlＯ4络合前后的结构变化及导电性能．实验结果表明，当ＰＥＵ与ＬｉＣlＯ4络合后，正电子素（o－Ｐｓ）的寿命及其强度均减少，而中间寿命分量的湮没参数基本不变．这表明Ｌｉ杂质主要扩散在无序的非晶区．掺杂前后样品的温度实验表明，在玻璃化转变温度Ｔg之下，络合前后的自由体积分数的变化很小，这与自由体积理论预言的结果一致．在Ｔg之上，络合后的自由体积空洞的浓度和自由体积分数均减小．此外，ＰＥＵ－ＬｉＣlＯ4络合物的电导率随温度和Ｌｉ杂质浓度的变化可以用自由体积理论解释．Positron annihilation lifetime spectra have been measured for polymer electrolyte poly (ether urethane) (PEU). The variations of the positron annihilation parameters as a function of Li - dopant concentration show that the Li - dopants diffuse mostly into the amorphous regions. The temperature dependances of the o - Ps lifetime and its intensity give the information about the structural transition of PEU and PEU - LiClO4. The relation between the conductivity of PEU - LiClO4 and temperature can be explained by the theory of free volume.
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中国物理学会期刊
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