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Abstract

Potassium cellulosates of rayon fibers were formed by means of an exchange reaction between preswollen rayon yarns and potassium methoxide in anhydrous methanol. Degree of substitution (DS) values up to one are achieved by control of the potassium methoxide concentration, and the reaction is complete in about 5 min at room temperature. Significantly higher DS values are obtained at any given potassium methoxide concentration by the use of such cosolvents as dimethyl sulfoxide and pyridine. Analytical studies indicate that at least 80-90% of the bound potassium is in the form of a true cellulosate. The exchange reaction used to form the cellulosate does not lead to chemical degradation of the cellulose, as determined from intrinsic viscosity and mechanical properties measurements. The potassium cellulosates are highly reactive intermediates for the preparation of cellulose derivatives, and act as initiators for the anionic graft polymeriza tion of vinyl monomers.

Keywords

Rayon (regenerated cellulose fibers) yams rayon yarns (slack)rayon yarns (tensioned)potassium methoxide alkali metal alkoxides acrylonitrile vinyl monomers reactants. Chemically modified rayon. Cellulose fibers. DMSO DMF pyridine methanol nitrogen solvents. Concentration time temperature. Cellulosates alkoxide adducts DS metal uptake degradation viscosity initiators grafting electropositivity organometallic bond color solvation ion- pairs tenacity elastic modulus extension-to-break. Cellulosate formation. Reactions (chemical)hydrolysis extrac tion chemical analysis physical testing.

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Formation and Characterization of Potassium Cellulosates

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