Premium
Compositional Effects on Structure and Transport Properties in a Polyelectrolyte Gel
Author(s) -
Forsyth M.,
Every H. A.,
MacFarlane D. R.,
TravasSejdic J.,
Steiner R.
Publication year - 2002
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/1439-2054(20020801)287:8<523::aid-mame523>3.0.co;2-f
Subject(s) - polyelectrolyte , materials science , lithium (medication) , electrolyte , copolymer , solvent , ionic conductivity , ethylene carbonate , ionic bonding , chemical engineering , diffusion , polymer chemistry , ion , inorganic chemistry , chemistry , polymer , organic chemistry , thermodynamics , medicine , physics , engineering , composite material , electrode , endocrinology
The copolymerization of lithium 2‐acrylamido‐2‐methyl‐1‐propane sulfonate (LiAMPS) with N , N ′ ‐dimethylacrylamide has yielded polyelectrolyte systems which can be gelled with an ethylene carbonate/ N ′ , N ′ ‐dimethylacetamide solvent mixture and show high ionic conductivities. 7 Li linewidth and relaxation times as well as 1 H NMR diffusion coefficients have been used to investigate the effect of copolymer composition as well as copolymer concentration in the gel electrolyte with respect to ionic transport and polyelectrolyte structure. It appears that ion association is likely even in the case of low lithium salt concentration; however a rapid exchange exists between the associated and non‐associated lithium species. Beyond 0.2 M of LiAMPS, both the conductivity and solvent diffusion reach a plateau, whilst lithium ion linewidth and spin‐spin relaxation are suggestive, on average, of a less mobile species. The thermal analysis data is also supportive of this association effectively leading to a form of phase separation on the nanoscale, which gives a lower overall activity of lithium ions in the solvent rich regions beyond about 0.2 M of LiAMPS, thereby leading to an increase in the final liquidus temperature of the binary liquid solvent from –9 to +5°C.