K. Schultes, B. A. Wolf, W. H. Meyer and G. Wegner
"Continuous fractionation of a ionene containing cycloaliphatic moieties and dependence of glass transition on molar mass"
Acta Polymerica 1995, 46, 367-372.
Abstract: About 340 g of a cycloaliphatic ionene (see formula given in the introduction) were fractionated by a continuous countercurrent extraction method (CPF). The efficiency of the separation was checked by viscometry and gel permeation chromatography (GPC). Ten different fractions with number average molecular masses between 16 000 and 29 000 D were obtained and their glass transition temperatures T-g determined by differential scanning calorimetry (DSC) for their bromide and tetrafluoroborate salts. No molecular weight dependence of T-g was found, in contrast to recently reported results with aliphatic ionenes, where - in case of the bromide - T-g increases with rising molecular weight.
preprint number: 164