STUDIES OF WATER IN NAFION MEMBRANES - USING DEUTERON AND O-17 NUCLEAR-MAGNETIC-RESONANCE, AND DIELECTRIC-RELAXATION TECHNIQUES

被引:61
作者
CHEN, RS
JAYAKODY, JP
GREENBAUM, SG
PAK, YS
XU, G
MCLIN, MG
FONTANELLA, JJ
机构
[1] MCMASTER UNIV,DEPT MAT SCI,HAMILTON L8S 4L7,ONTARIO,CANADA
[2] USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402
关键词
D O I
10.1149/1.2056223
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Deuteron and oxygen-17 nuclear magnetic resonance measurements and dielectric relaxation studies of Nation-117 membranes with variable water content (approximately 5-18% by weight) have been carried out. Glassy behavior of the water domains at low temperature, below ca. 200 K, is evidenced by the specific nature of the H-2 NMR line shapes. Activation energies extracted from H-2 spin-lattice relaxation data on the high temperature side of the T1 minimum exhibit a steady increase with increasing water content. In spite of a high degree of molecular mobility, angular-dependent spectra in both as-received and stretched samples reflect considerable anisotropy of the host polymer. A dielectric loss peak is observed which previously has been attributed to the glass transition of the aqueous domains.
引用
收藏
页码:889 / 895
页数:7
相关论文
共 22 条
[1]  
ABRAGAM A, 1961, PRINCIPLES NUCLEAR M, pCH7
[2]   A STUDY OF THE BEHAVIOR OF WATER IN NAFION MEMBRANES [J].
BOYLE, NG ;
MCBRIERTY, VJ ;
DOUGLASS, DC .
MACROMOLECULES, 1983, 16 (01) :75-80
[3]   DIELECTRIC RELAXATION IN GLYCEROL, PROPYLENE GLYCOL, AND NORMAL-PROPANOL [J].
DAVIDSON, DW ;
COLE, RH .
JOURNAL OF CHEMICAL PHYSICS, 1951, 19 (12) :1484-1490
[4]   AN INFRARED STUDY OF WATER IN PERFLUOROSULFONATE (NAFION) MEMBRANES [J].
FALK, M .
CANADIAN JOURNAL OF CHEMISTRY, 1980, 58 (14) :1495-1501
[5]   PRESSURE AND TEMPERATURE DERIVATIVES OF LOW-FREQUENCY DIELECTRIC-CONSTANTS OF LIF, NAF, NACL, NABR, KCL, AND KBR [J].
FONTANELLA, J .
PHYSICAL REVIEW B-SOLID STATE, 1972, 6 (02) :582-+
[6]   ELECTRICAL RELAXATION IN POLY(PROPYLENE OXIDE) WITH AND WITHOUT ALKALI-METAL SALTS [J].
FONTANELLA, JJ ;
WILSON, JJ ;
SMITH, MK ;
WINTERSGILL, MC ;
COUGHLIN, CS ;
MAZAUD, P ;
GREENBAUM, SG ;
SIDDON, RL .
SOLID STATE IONICS, 1992, 50 (3-4) :259-271
[7]   HYDROGEN EVOLUTION ON COPPER, SILVER AND GOLD ELECTRODES IN AQUEOUS PERCHLORIC-ACID FROM 130-K TO 300-K [J].
FRESE, U ;
STIMMING, U .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1986, 198 (02) :409-416
[8]   EXPERIMENTAL-DETERMINATION OF THE TRANSPORT NUMBER OF WATER IN NAFION-117 MEMBRANE [J].
FULLER, TF ;
NEWMAN, J .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1992, 139 (05) :1332-1337
[9]   RELAXATION PROCESSES IN WATER - SPIN-LATTICE RELAXATION OF DEUTERON IN D2O AND OXYGEN-17 IN H217O [J].
HINDMAN, JC ;
ZIELEN, AJ ;
SVIRMICKAS, A ;
WOOD, M .
JOURNAL OF CHEMICAL PHYSICS, 1971, 54 (02) :621-+
[10]   PROTON MOBILITY IN LIQUID AND FROZEN HCLO4.5.5H2O - NMR AND CONDUCTIVITY MEASUREMENTS [J].
HUANG, TH ;
DAVIS, RA ;
FRESE, U ;
STIMMING, U .
JOURNAL OF PHYSICAL CHEMISTRY, 1988, 92 (24) :6874-6876