The behaviour of some polyurethane thiosulphate and sulphonate ionomers in dilute solutions is reported. Viscosity measurements of the ionomers in N,N'-dimethylformamide (DMF) showed a 'polyelectrolyte effect', which diminished upon addition of lithium bromide. For water-soluble ionomers, measurements were carried out in aqueous solution. The effect of the counterion was examined. Anomalous molecular-weight distributions of the ionomers were observed by gel permeation chromatography (g.p.c.) using DMF as solvent, which depended on the polymer ionic content, solution concentration and temperature. Normal g.p.c, distributions were obtained, however, in solvent containing 0.5% of lithium bromide.
Посилання на статтю:
Dilute-solution behaviour of polyurethane ionomers / T. Y. T. Chui, M. H. George* and J. A. Barrie // Polymer. – 1992. – Vol 33. – P. 5254-5258.