Modified cellulose acetate prepared from acetic anhydride reacted with cellulose dissolved in a chloral–dimethylformamide mixture

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Abstract
A bleached sulfite pulp (85.0% α‐cellulose) was dissolved in dimethylformamide containing anhydrous chloral and pyridine as catalyst. The clear cellulose solution was then reacted with acetic anhydride under various conditions. The reaction products contained both acetyl groups and chlorine in amounts varying from 20% to 38%. Curves of reaction rates with respect to chlorine and acetyl groups under various conditions of temperature and reactant ratios were similar in appearance, and all the products contained approximately 2 moles of acetyl groups per mole of chloral. Yields varied from 180% after treatment at room temperature (25°C) for 1 hr to 250% after 4 hr. The products could be hydrolyzed in acid with some difficulty but very easily in dilute alkali. The products had low flammability and hygroscopicity. Films cast form acetone solutions had higher permittivity and lower a.c. conductivity than similar films made from cellulose diacetate.

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