Prusov A.N.

CHEMICAL TRANSFORMATION OF TECHNICAL FIBER OF FLAX, HEMP AND JUTE TO CELLULOSE AND THEIR PYROLYSIS

Taking into account the chemical composition and morphological features the tech-nical high purity fibers of flax, hemp and jute were studied as a new potential source of cellu-lose. The kinetics of the oxidation-hydrolytic method was shown for producing pulp from technical jute fibers in an aqueous alkaline medium containing the active components. The degree of removal of non-cellulosic components from technical jute fibers increases with the concentration of sodium hydroxide in an aqueous medium containing active additives, as well as with the increase in processing time and temperature. With the methods of chemical analysis, wide-angle X-ray scattering, FT-IR spectroscopy, electron microscopy the chemical composition and the supramolecular structure of the samples was studied. The thermal stabil-ity of the technical fibers, flax pulp, jute and hemp were determined. It was found that the ob-tained samples of linen, hemp and jute cellulose have I monoclinic modification.

2016, Т. 59, № 6, Стр. 97‒104

DEPENDENCE OF DISSOLUTION ENTHALPY OF POLYVINYLPYRROLIDONE IN WATER ON ITS INITIAL MOISTURE CONTENT

Changes in integral and differential enthalpies of dissolution of polyvinylpyrrolidone (PVP) of different molecular weight in water were determined as a function of initial moisture content of the polymer. Hydration numbers were calculated.

Key words: polyvinylpyrrolidone, dissolution enthalpy, hydration numbers

REFERENCES
1. Sidelkovskaya F.P. Chemistry of N-vinylpyrrolidone and its polymers. M.: Nauka. 1970. 150 р (in Russian).
2. Prusov A.N., Radugin M.V., Lebedeva T.N., Prusova S.M., Zakharov A.G. // Boepripasy. 2010. N 2, P. 44-49 (in Russian).
3. Dumanskiy A.V., Nekryach E.F. // Colloid. Zhurn. 1953.
V. 15. N 2. P. 91-98 (in Russian).
4. Radugin M.V., Lebedeva T.N., Prusov A.N., Zakharov A.G. // Zhurn. Fizich. Khim. 2011. V. 85. N 5. P. 987-989 (in Russian).
5. Dole M., Faller I.L. // J. Chem. Soc. 1950. V. 72. P. 414-419.
6. Tager А. Solutions of polymers. M.: Goskhimizdat. 1951. 208 p. (in Russian).

2016, Т. 59, № 5, Стр. 27-29

INTERACTION OF HIGH-PURITY CELLULOSE WITH BINARY FLUIDS: WATER / DMSO AND WATER / ETHANOL

Interaction of cellulose samples with dimethylsulfoxide, ethanol and water and organic liquids on their basis was studied with the methods of calorimetry and effusion depending on the content of the organic component. The dependence of the enthalpy of the interaction of the cellulose with individual and mixed liquids was analyzed. The same dependence was analyzed for liquid sorption as a function of liquid content in the amorphous regions of the polymer and the composition of the mixed liquor. The specific heat of adsorption of water, DMSO and ethanol with various cellulose samples was determined. The equation was proposed for estimating the enthalpy of the interaction of different types of cellulose with a liquid and its maximum sorption.

Key words: cellulose, structure, sorption, interaction enthalpy, water, DMSO, ethanol

2016, Т. 59, № 4, Стр. 41-46
RSS-материал