Lignosulfonates are formed by the random breaking of the “infinite” lignin network in wood, resulting in smaller sulfonated fragments. The resulting lignosulfonate molecule might be best described as a randomly branched polyelectrolyte. In this study, the scaling laws for polyelectrolyte expansion for this model are derived, as well as scaling laws for other models for lignosulfonate. The author also compares scaling laws with experimental values. The polyelectrolyte expansion is in quantitative agreement with the randomly branched polyelectrolyte model, but it disagrees with the microgel models. The temperature dependence of the randomly branched polyelectrolyte model is in qualitative agreement with experimental results.
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Bernt O. Myrvold (2007) studied this question.
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