Ion and solvent dynamics in gel electrolytes based on ethylene oxide grafted acrylate polymers

Multinuclear pulsed field gradient NMR measurements and theological viscosity measurements were performed on three series of polymer gel electrolytes. The gels were based on a lithium salt electrolyte swollen into a copolymer matrix comprising an acrylate backbone and ethylene oxide side chains. In each series the side chains differed in length and number, but the acrylate-to-ethylene oxide ratio was kept constant. It was found that the self-diffusion coefficient of the cations was much lower than that of the anions, and that it decreased rapidly when the side chains got longer. In contrast, the self-diffusion coefficient of the anions was found to be independent of chain length. In the gel electrolytes, the diffusion coefficients of the solvent molecules are relatively constant despite an increased viscosity with increasing length of the side chains. However, in saltfree gels made for comparison, the diffusion coefficients of the solvent molecules decreased with, increasing length of the side chains, which is consistent with an increased viscosity.

Forsyth, M(SwePub:) (författare)
Gavelin, Patrik(SwePub:lu)poly-pga (författare)
Jacobsson, P(SwePub:) (författare)
Oradd, G(SwePub:) (författare)
Orädd, Greger,Umeå universitet, Kemi(SwePub:umu)gror0001 (författare)
Lunds universitet.Gemensamma institutioner för naturvetenskapliga och tekniska fakulteterna.Kemicentrum.Kemiska institutionen.Polymer- och Materialkemi (LTH).(SwePub:lu)
Lund University.Common departments, the faculties of Science and Engineering.Center for Chemistry and Chemical Engineering.Department of Chemistry.Polymer and Materials Chemistry (LTH).(SwePub:lu)
Umeå universitet.Teknisk-naturvetenskaplig fakultet.Kemi.(SwePub:umu)868
Chalmers tekniska högskola.School of Physics and Engineering Physics.Institutionen för teknisk fysik.(SwePub:scigloo)55
Chalmers University of Technology.School of Physics and Engineering Physics.Department of Applied Physics.(SwePub:scigloo)55
Chalmers tekniska högskola.School of Physics and Engineering Physics.Institutionen för experimentell fysik.(SwePub:scigloo)62
Chalmers University of Technology.School of Physics and Engineering Physics.Department of Experimental Physics.(SwePub:scigloo)62