Abstract
Polymer bridging by high molecular weight polyethylene oxide (PEO) is enhanced by a cofactor, usually a low molecular weight phenolic compound. PEO-cofactor systems are widely used in papermaking as a so-called retention aid. In this study the effects of one particular cofactor, sulfonated kraft lignin (SKL), on polymer bridging by PEO, was investigated. The deposition of latex spheres on a glass surface coated by PEO was observed with the impinging jet technique. The deposition kinetics were mainly controlled by electrostatics, since both the latex particles and the PEO-SKL complexes formed at the surface are negatively charged. The detachment kinetics were strongly affected by SKL as the fraction of very strongly bound particles increased. At SKL concentrations above 1 mg l −1 it took longer for the weakly bound particles to detach. These studies show that SKL strengthens the PEO bridge between latex and glass.
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