Degree f Crystallinity of Cellulose Material by　Fibrous Acetylation

Investigation of fibrous acetylation of cellulose materials shows a definite per cent of each sample can be more rapidly esterified than the rest. Furthermore，this percent is not dependent on the temperature and the concentration of catalyst of acetylation，but peculiar to the original cellulouse material. If we regard the easily esterified part as the amorphous part of cellulose fibre and the rest as the crystalline part， we can obtain the degree of crytallinity of cellulose material by its fibrous acetylation. Absorbent cotton bleached ramie and hydrocellulose from It gave degrees of crystallinity of 78, 81 and 59 respectviely