Water absorption and proton conductivity of sulfonated acrylamide copolymers

被引:82
作者
Karlsson, LE [1 ]
Wesslén, B [1 ]
Jannasch, P [1 ]
机构
[1] Lund Univ, Dept Polymer Sci & Engn, SE-22100 Lund, Sweden
关键词
proton conducting polymer electrolyte; 2-acrylamido-2-methyl-1-propanesulfonic acid copolymer; polyelectrolyte; water absorption; state of the water;
D O I
10.1016/S0013-4686(02)00244-X
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Copolymers of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and N-tert-butylacrylamide (tBAA) have been evaluated as proton conducting materials. The water absorption of copolymers with varying equivalent weights (EW), i.e. g polymer/mol sulfonic acid groups, was studied at different relative humidities (rh) by gravimetry and calorimetry. Melt endotherms for water were detected by DSC in copolymers containing greater than or equal to 45 mol% AMPS when equilibrated at 93% rh, and greater than or equal to 36 mol% AMPS when equilibrated at 98% rh. A study of the kinetics of the water absorption at 98% rh showed that equilibration was faster for the copolymers than for the homopolymer PAMPS. The proton conductivity (Q) of the samples was investigated as a function of temperature, water content, and EW. ac Impedance measurements between -20 and 70 degreesC showed a value of sigma as high as 0.2 S/cm at 70 degreesC for a copolymer containing 54 mol% AMPS equilibrated at 98% rh. It was concluded that both the EW and the amount of water in the polymers controlled the conductivity at all temperatures. For example, increasing amounts of water in the polymers generally gave increasing sigma above the melting point of the water, but decreasing Q below the same temperature. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3269 / 3275
页数:7
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