Abstract
A lignosulfonate sample was fractionated according to the solubility in ethanol–water. The fractions were analysed by aqueous size exclusion chromatography (SEC) combined with in-line multi-angle laser light scattering (MALLS), and by static MALLS. Satisfactory SEC results were obtained with aqueous phosphate buffer containing DMSO and SDS. The refractive index increment (d n/d c) varied from 0.186 to 0.205 ml/g, depending on M w and the degree of sulfonation. The second viral coefficient ( A 2) was 7×10 −3 ml mol/g 2. The weight-average molecular weight ( M w) of the fractions varied from 4600 up to 398 000 g/mol, and the polydispersity ( M w/ M n) varied between 1.3 and 3.5.
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