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Water absorption and proton conductivity of sulfonated acrylamide copolymers

Karlsson, Lina LU ; Wesslén, Bengt LU and Jannasch, Patric LU (2002) In Electrochimica Acta 47(20). p.3269-3275
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Proton conducting polymer electrolyte, 2-Acrylamido-2-methyl-1-propanesulfonic acid copolymer, Polyelectrolyte, Water absorption, State of the water
in
Electrochimica Acta
volume
47
issue
20
pages
3269 - 3275
publisher
Pergamon
external identifiers
  • wos:000177686700004
  • scopus:0037025885
ISSN
0013-4686
DOI
10.1016/S0013-4686(02)00244-X
language
English
LU publication?
yes
id
77a8dcd0-2e58-4ff4-885d-57fe241abd28 (old id 150823)
date added to LUP
2007-07-13 12:50:47
date last changed
2017-09-24 03:43:22
@article{77a8dcd0-2e58-4ff4-885d-57fe241abd28,
  abstract     = {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.},
  author       = {Karlsson, Lina and Wesslén, Bengt and Jannasch, Patric},
  issn         = {0013-4686},
  keyword      = {Proton conducting polymer electrolyte,2-Acrylamido-2-methyl-1-propanesulfonic acid copolymer,Polyelectrolyte,Water absorption,State of the water},
  language     = {eng},
  number       = {20},
  pages        = {3269--3275},
  publisher    = {Pergamon},
  series       = {Electrochimica Acta},
  title        = {Water absorption and proton conductivity of sulfonated acrylamide copolymers},
  url          = {http://dx.doi.org/10.1016/S0013-4686(02)00244-X},
  volume       = {47},
  year         = {2002},
}