The possibility of obtaining modified cellulose products by reacting cellulose xanthogenate in solutions containing oxidizers and acrylonitrile was studied. The ability of the cellulose xanthogenate–hydrogen peroxide redox system to initiate graft copolymerization of acrylonitrile on the cellulose was demonstrated. The influence of various factors on the processes was investigated. An attempt was made to clarify the nature of the reactions involved.
The complexation processes of Cu (II), Co (II) and Ni (II) ions in ammonia solutions with diacylhydrazines of non-pentane acid (DAH): 1,2-dineopentanoyl- (DNH) and 1-neopentanoyl-2-benzoylhydrazine (NBH) were studied. Using saturation, equilibrium shift, curve intersection, and conductometric titration, the formation of complex compounds with the ratios [M (II)]:[DAH] = 1:1 and 1:2 was established. The DNH complex with Cu (II) (1:1) was preparatively isolated, the composition of which was confirmed by the data of IR spectroscopy, elemental and thermal analyzes. The SP precipitate of the complex and the complexation reaction constant are calculated
With the increase of the mercerization temperature of the cellulose in the process of viscose production from 20 to 105"C, the quality of the obtained viscose goes through a minimum at 70"C, while 105°C is the most advantageous temperature. The kinetics of xanthogenation after mercerization at the three indicated temperatures has been investigated. It is established that the kinetic characteristics of the xanthogenation are improved in the same order of temperatures of the preliminary mercerization. This shows that the advantageous effect of the high-temperature mercerization on the quality of the viscose is in direct connection with the favourable effect of the mercerization on the xanthogenation.
Zur Kinetik der Xanthogenierung nach einer Hochtemperatur-MerzerisationBei Erhohung der Merzerisationstemperatur im Bereich von 20 bis 105°C durchlauft die Qualitit der erhaltenen Viskose ein Minimum bei 70°C; 105°C envies sich als die giinstigste Temperatur. Die Kinetik der Xanthogenierung nach einer Merzerisation bei den genannten Temperaturen wurde untersucht. Die kinetischen Charakteristika des Xanthogenierungsprozesses verbessern sich in der Reihenfolge 70"C, 20°C, 105°C. Dies zeigt, daD der frither gefundene giinstige EinfluD einer Hochtemperatur-Merzerisation auf die Qualitat der Viskose mit dem EinfluB der Merzerisation auf die Xanthogenierung zusammenhangt.
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