A new method is investigated to determine by means of potentiometric titration the degree of ripening of viscose. It is found that when the e.m.f. of a characteristic inflection in the potentiometric titration curve is plotted against a measure of the degree of viscose ripening a sharp minimum occurs at a point corresponding to the optimal degree of ripening. Moreover, evidence is offered to indicate the formation of sodium dithiocarbonate in viscose during ripening. This last fact leads to a reasonable postulation of the complete scheme of reactions taking place in a ripening viscose.
En cherchant à interpréter la courbe expérimentale de la titration potentiométrique de la viscose par l'AgNO3, 0.1 N, on a découvert que les composés sulfurés de la viscose devaient se trouver sous la forme “ortho.” Ceci a permis de proposer une nouvelle théorie du mürissement de la viscose.
La viscositC de structure de la viscose Par P. HERRENT, A. LUDE et F. MOURAUX (Tubize) SOMMAIRE. -Le prksent travail a pour objet l'examen des propribtks rhkologiques des solutions de viscose du type utilisk dans I'industrie de la rayonne. La viscose, &ant une solution colloTdale concentrke de xanthate de cellulose, devait montrer le phimomhe de viscositk de structure. Dans le cas de la viscose technique, la viscositk de structure est due CENTRE DE RECHERCHES DE LA S. A. FABELTA, TUBIZE. Cornmunip+ ri la SociBC Chimique a2 Belgique le 15 mars 1951.
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