THE INVESTIGATION OF CELLULOSE POLYMORPHS IN DIFFERENT PULPS USING 13C CPMAS NMR

ABSTRACT In order to obtain information about the crystallinity and polymorphs of cellulose and the occurrence of hemicelluloses in pulp fibers, wood cellulose, bacterial cellulose, cotton linter, viscose and celluloses in different pulps were investigated by solid state 13 C CPMAS NMR spectroscopy. A mixed softwood kraft pulp and a dissolving pulp were treated under strongly alkaline and acidic conditions and the effect on the cellulose crystallinity was studied. The presence of different crystalline polymorphs of cellulose and the amount of hemicelluloses are considered.