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Abstract
Proton nuclear magnetic resonance (1H-nmr) techniques have been used for the determination of the molar substitution (MS) of hydroxypropyi cellulose. The method for measuring MS was based on the hydrolysis of hydroxypropyi cellulose with concentrated deuteriochloric acid (DC1) and integration of area of the nmr peaks of the hydrolyzed product. The results obtained by the proposed nmr method agreed well with those provided by the chromic acid oxidation distillation method. Furthermore, according to the established relationship between average MS and the content of hydroxypropyi group (HC), the MS of hydroxypropyi cellulose was also calculated, and therefore further verifying the accuracy of the nmr data.