| summary(En) : | Methyl methacrylate (MMA) was grafted onto alkali-swollen cellulose (A-Cellulose) by the ceric ion method, and the effects of swelling on the degrees of reaction and the characteristics and properties of graft copolymer were studied in comparison with those of beating. Forty per cent of ethylenediamine (EDA) ethanol solution (EDA(E)), 80% EDA(E), 80% EDA aqueous solution (EDA(A)) and 20% NaOH aqueous solution were used as swelling agents. Hydrolyzable region of A-Cellulose was not superior to that of beaten celluloses (B-Cellulose). Alkali treatment, however, resulted in the increase in all of the degrees of reaction, especially in grafting efficiency, in contrast with beating. Alkali treatment and beating showed the same results in the increase in weight average molecular weight of grafted polymethyl methacrylate (PMMA) and the decrease in number of grafted chains. Weight loss and hydrolyzed cellulose of graft copolymer of A-Cellulose (A-G-Cellulose) by acid hydrolysis increased markedly except those treated with 40% EDA(E), but the extraction of grafted PMMA accompanied by hydrolysis was difficult in comparison with that of graft copolymer of B-Cellulose (B-G-Cellulose). Moisture regain of A-G-Cellulose and B-G-Cellulose increased with the increase in hydrolyzable region, and the treatment with 20% NaOH resulted in marked effect. These results suggest that interfibrillar and intramicellar swellings with alkalis were retained to some extent in A-G-Cellulose with packed PMMA, and that acid reactivity and moisture regain of A-G-Cellulose increased in comparison with B-G-Cellulose. Such effect of treatment increased in the following order; 40% EDA(E) < beating < 80% EDA(A) < 20% NaOH. |
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