Abstract
A quantitative study has been carried out of the formation of polyelectrolyte complexes between calcium lignin sulphonate (LS) and three cationic polyelectrolytes, two polytrimethylaminoethylmethacrylates (I and II) with different molecular weight and one acrylamide copolymer. The parameters studied were the weight ratio of the oppositely charged polymers, the concentration of NaCl and the temperature. Separated molecular weight fractions of LS were studied in combination with I. The interactions were found to result in soluble complexes, colloids or macroscopic precipitates, mainly depending on the polymer weight ratio and the molecular weight of LS. For fractions with M w was ⪢ 1000 the complexation between I and LS was stoichiometric when LS was present in excess of charge equivalence, resulting in formation of only macroscopic precipitate and quantitative precipitation. Soluble polyelectrolyte complexes were formed with LS if the M w was < 1000 and I was in excess. Very stable colloids were formed with this LS fraction and I. In unfractionated LS, these soluble complexes are probably adsorbed on precipitating particles containing high molecular weight LS and I.
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