Heats of mixing of poly(styrenesulphonic acid) and its tetramethylammonium salt with alkali-metal poly(styrenesulphonates) in dioxan + water mixtures

Abstract

The heats of mixing of poly(styrenesulphonic acid) and its tetramethylammonium salt with alkali-metal poly(styrenesulphonates) have been measured at 25 °C in 25 and 50 wt% dioxan + water mixtures. The solutions to be mixed were of the same concentration (0.06 mol dm^–3). The heat effects were similar to those observed in aqueous solutions, i.e. either endothermic or exothermic. The experimental results are qualitatively interpreted in terms of the solute–solvent structural properties.