GRAFT COPOLYMERIZATION OF ACRYLAMIDE ONTO GEL-CELLOPHANE BY CERIC ION METHOD

V. RELATION BETWEEN THE FINE STRUCTURE OF CELLULOSE AND THE GRAFTING REACTIVITY

Abstract

The effects of the fine structure of cellulose were studied on the grafting reactivity.
As the factors of the fine sturcture of cellulose, the crystallinity and the ratio of diffraction intensity, (10_??_)+(002)/(101), were selected.
The grafting yield was found to decrease as the crystallinity and (10_??_)+(002)/(101) increased.
On the basis of the results obtained here, the grafting polymer is presumed to be formed mainly at the amorphous region of cellulose and the space between the micelles oriented to the direction of (101) planes.
In addition, the effects of the above factors were studied on the moisture regain.
Since the behavior between the grafting reactivity and the moisture regain in relation to (10_??_)+(002)/(101) was given the opposite result, the grafting reactivity is presumed to be affected by the physical factor such as the space between the micelles, in addition to the chemical factor such as the reactivity of hydroxy group, and the grafting polymer is presumed to be formed easily at the larger space between the micelles.
Further, in the case of film having the constant crystallinity and (10_??_)+(002)/(101), the relation between the film thickness and the grafting reactivity was studied.
The grafting yield was found to change by the film thickness and to reach the maximum yield at 400μ.
From the result that the grafting yield was decreased as the film thickness increased at above 400μ, the grafting polymer is presumed to be formed easily at the surface layer of the film and not distributed uniformly through the whole layer of the film, and also the grafting reactivity is presumed to be disturbed by the oxidation of cellulose with Ce^IV, in review of the grafting behavior at below 400μ.