高分子の分別沈殿に関する研究(第4報) : CMCナトリウム塩の分別沈殿および沈殿濁度滴定について

概要

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A mixture of water and alcohol containing sodium iodide was selected as the precipitant to be used in fractional precipitation of sodium carboxymethyl cellulose. The condition of fractionation was examined and raw sodium carboxymethyl cellulose was divided into eleven fractions. The substitution degree and molecular weight of each fraction were measured. From these results the molecular weight distribution in the raw material was obtained. Then, the turbidimetric titrations of the fractions 2,4,6,8 and 10 were carried out. From these results, it was obtained that the relation between log C_p and (v_2) ppt, where C_p is the polymer concentration and (v_2) ppt is the volume fraction of the precipitant added when the precipitation starts, was linear for each polymer fraction and parallel to one another. These results were in good agreement with Morey-Tamblyn's empirical equation. The final equation obtained for this system was ; (v_2) ppt=-0.050 log C_p+0.918 M^<-0.954>.
公益社団法人日本薬学会の論文
1969-02-25