Insolubilization of Lignosulfonate by Oxidative Coupling

概要

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Lignosulfonate has a lot of sulfonate group in macromolecules. Thus the polymer could be used as an ion exchange resin, if the polymer somehow can remain insolubility at the higher pH region.<BR>However, the insolubilization of lignosulfonate by building up the molecular weight was generally rather difficult, because strong electrostatic repulsion force between ionized sulfonate groups reduced intermolecular coupling.<BR>Thus, the addition of cationic polyelectrolytes such as polyethylenimine (PEI) in the reaction system was studied. The presence of PEI in the system of oxidative coupling of lignosulfonate with potassium ferricyanate successfully produced insoluble lignosulfonate and its ion exchange capacity was 1.3 (m equ./g).<BR>It was also noted that the oxidative coupling of lignosulfonate on the surface of PEI impregnated cellulosic fiber could irreversibly trap lignosulfonate on the fiber surfaces.
Japan Society of Colour Materialの論文