A new process of decrystallization and partial acetylation of cellulosic materials

Abstract

Abstract A new process of decrystallization of cellulosic materials 8 is described. The process involves the preparation of alkali‐cellulose and an interaction between alkali‐cellulose and acetic anhydride. The decrystallized products thus obtained are partially acetylated and are designated as SPA (S for swollen, PA for partially acetylated) products. The effect of varying the alkali concentration on the structure and mechanical properties of SPA products is described. Maximum decrystallization is obtained when the swelling is carried out in alkali of intracrystalline swelling strength, prior to treatment with acetic anhydride. Acetylation is instrumental in retaining the highly decrystallized state. The structure of SPA cotton was characterized using chemical analyses, infrared spectroscopy, and x‐ray diffraction.