STUDIES ON THE STATE OF SOLUTION OF VISCOSE

Instability of the nature of viscose makes viscose study difficult. Diethylacetamide cellulose xanthate (DA-xanthate) obtained from viscose is stable, and it had been used for determination of γ value of viscose. Schurz noticed that the nature of DA-xanthate is similar to that of the original viscose. So he studied fluidity of dimethylsulfoxide solution of DA-xanthate, and found that the properties of solution represented not only the average molecular weight of cellulose, but also the state of original viscose solution. The purpose of the present paper is to examine the possibility of application of DA-xanthate for a viscometric study of viscose. So the symbols “[η]” and “k” in the Martin's eqation, log (ηsp/C)=log [η]+k [η] C are used as parameters relating to the state of solution as in the preceeding paper. The variations of these parameters of DA-xant-hate are compared with those of viscose. The results obtained are as follows:The ripened viscose differs from the unripened viscose in γ value and the state of solution. Marked differences in γ value and the state of solution could be also found between DA-xanthates prepared from the ripened and unripened viscoses respectively. However a trend of variation in “k” of DA-xanthate differs from that of viscose. Consequently the conclusion drawn by Schurz that the state of dimeth ylsulfoxide solution of DA-xanthate representes that of original viscose could not be approved within the range of the experiments.