ケテンによるビスコース法人造繊維の繊維状酢化

第3報 反応の経過について(その2)

抄録

We have found in the previous paper that, when the viscose rayon containing the aquous solution of inorganic salts was acetylated by ketene, the water was converted predominantly into acetic anhydride and the cellulose began to be acetylated. Applying this finding the fiber which contained acetic anhydride and inorganic salts in the swelling state was first prepared, and then the fiber was allowed to react with ketene at various temperatures, and the aspect of the acetylation was observed.
It was found that the reaction of the acetylation was affected by the microscopic structure of fiber, and the acetylation rate agreed with the first order equation of reaction only at the initial stage of reaction.
The same tendency was also found when excess acetic anhydride vapour existed from the first in the reaction system, and as the temperature of reaction was raised, the acetylation rate agreed with the first order equation of reaction over a wide range.