Change in polydispersity of degree of esterification of cellulose xanthate during the process of viscose ripening

Conclusions A method of determining the polydispersity of the degree of esterification () of the cellulose xanthate in viscose has been proposed, plus an algorithm for calculating it.The change in density of distribution of in cellulose xanthate during viscose ripening over a period of 96 h at 16°C has been studied.It has been found that the dispersion in density of distribution of in cellulose xanthate continuously decreases during ripening.Translated from Khimicheskie Volokna, No. 1, pp. 18–21, January–February, 1989.     

Preparation of an anion-exchange viscose fibre by graft polymerization to cellulose during the spinning process

Conclusions The fundamental possibility of modifying viscose fibres by graft polymerization of DVPS by a continuous method during the course of spinning has been demonstrated.The fibre obtained has anion-exchange properties and has satisfactory sorptive and physico-mechanical indices, comparable with those of TsM-A2 fibre.Translated from Khimicheskie Volokna, No. 2, pp. 28–30, March–April, 1987.     

Properties of viscose prepared from modified cellulose

Conclusions Some basic characteristics of viscose prepared from radiation-modified cellulose as compared with standard viscose have been determined.It has been shown that viscose from RMC has an increased coagulation resistance and increased physicochemical uniformity as compared with standard viscose of analogous composition.Translated from Khimicheskie Volokna, No. 2, pp. 32–34, March–April, 1990.     

Processing sulfate viscose cellulose prepared using oxygen in bleaching

Conclusions -- Two lots of cellulose, from pine wood and from larch, have been developed; these were treated in the first stage of bleaching with oxygen in alkaline medium instead of by chlorination, under experimental conditions.-- From a preliminary evaluation, the process of viscose preparation and preparation of the viscose for spinning under experimental conditions took place without significant deviations from the accepted technological regime. Higher technological indices of the viscose from pine cellulose were noted.-- The process of spinning viscose fibre from experimental lots of viscose from larch wood and from pine took place in a stable fashion; no clogging of the spinnerets was observed.Translated from Khimicheskie Volokna, No. 5, pp. 17–19, September–October, 1990.     

Spectrophotometic determination of the degree of esterification of cellulose xanthate in viscose

Conclusions The spectrophotometric method permits a rapid determination of the value of CS₂ for xanthate in viscose. The duration of such a determination is 20–30 min. The method is recommended for the analysis of viscose under production conditions and for investigational work.All-Union Research Institute for Synthetic Fibres (VNIIV). Translated from Khimicheskie Volokna, No. 5, pp. 71–72, September–October, 1969.     

Dependence of micrononuniformity of viscose on pentosan content of the cellulose

Conclusions The allowable level of pentosan content in cellulose for chemical processing is determined not only by economic advantages, but mainly by the technological processes of processing the cellulose.The viscose turbidity spectrum method is necessary to control the quality of cellulose from deciduous tree wood, which contains a large amount of xylan; this can adversely affect the microuniformity of the viscose. It can also be recommended for characterizing the viscose preparation process at various stages.Translated from Khimicheskoe Volokna, No. 3, pp. 25–27, May–June, 1988.