COMPLEX IMPEDANCE AND MULTIFREQUENCY NA-23 NMR-STUDY OF POLY(PROPYLENE OXIDE) COMPLEXED WITH NAB(C6H5)4

被引：20

作者：

PAK, YS ^{[1
]}

ADAMIC, KJ ^{[1
]}

GREENBAUM, SG ^{[1
]}

WINTERSGILL, MC ^{[1
]}

FONTANELLA, JJ ^{[1
]}

COUGHLIN, CS ^{[1
]}

机构：

[1] USN ACAD,ANNAPOLIS,MD 21402

来源：

SOLID STATE IONICS | 1991年 / 45卷 / 3-4期

关键词：

D O I：

10.1016/0167-2738(91)90162-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Complex impedance and multifrequency Na23 nuclear magnetic resonance (NMR) measurements on a poly (propylene oxide) :sodium tetraphenylborate, PPO8NaB(C6H5)4, solid polymer electrolyte, with a composition of eight ether oxygens per sodium, are reported. The NMR linewidths are found to be second-order quadrupole broadened, thus indicating low site-symmetry for the Na+ ions. The title compound exhibits some interesting differences in properties compared to other PPO-Na salt complexes, including an anomalously low value of the stretched exponential parameter beta-se (obtained in fits to electric modulus data), an unusually high glass transition temperature (T(g) = 306 K), and sub-T(g) line narrowing of lower frequency Na-23 resonances. This last phenomenon is attributed to strong interaction between the Na+ ions and their large [B(C6H5)4] - counterions caused by the localization of the [B(C6H5)4]- anions in weak interactions with the polymer chains which, in turn, leads to the elevated glass transition temperatures.

引用

页码：277 / 284

页数：8

共 21 条

[1] IONIC-CONDUCTIVITY IN SOLID, CROSS-LINKED DIMETHYLSILOXANE-ETHYLENE OXIDE COPOLYMER NETWORKS CONTAINING SODIUM [J].