聚氧化乙烯-聚磷酸钠共混物的钠离子导电性

CATIONIC CONDUCTION FOR THE BLENDS FORMED BY POLY(ETHYLENE OXIDE)AND SODIUM POLYPHOSPHATE

研究了聚氧化乙烯-聚磷酸钠共混物的钠离子导电性和低分子量多缩乙二醇对共混物导电性的改进作用。结果表明,降低多缩乙二醇的分子量以及增加其含量都有利于提高共混物的离子导电率。增塑剂改进共混物导电性的实质是提高共混物的非晶相含量,共混物内钠离子传导发生在非晶区,聚合物链段运动是离子传导的主要推动力。

Poly (ethylene oxide)and sodium polyphosphate can form homogeneous blends, which exhibit single-Na+-ionic conduction. Conductivity of the blends thus prepared increases with adding plas-ticizer PEG(M)and with decreasing molecular weight (M)of PEG. An optimum Na+-ionic conductivity of 2. 7×10-7 S/cm at 25℃ was obtained for the blend [0. 5PEO-0. 5PEGC-100)]16-PphNa. The improvement of plasticizer on Na+-ionic conductivity could be attributed to the increase in amorphous regions responsible for sodium ion transport.