THE INFLUENCE OF LOW-TEMPERATURE PROCESSING OF CELLULOSE ON HEATS OF HYDRATION AND STRUCTURE CELLULOSE
UDC 676.023.1
Abstract
The urgency of the problem of modification of cellulose is dictated by the need to create the latest environmentally friendly technologies for processing cellulose using physical methods of exposure. The complex structure of crystalline and disordered zones, the presence of energetically-unequal system of hydrogen bonds largely determines the sorption, hydrophilic and paper-forming properties of cellulose composites. The method is developed of low-temperature processing of cellulose to create promising environmentally friendly technologies, in particular, for the production of fluff pulp and paper of low mechanical strength with high absorbency. The study of the freezing process of wet cellulose characterizes the behavior of cellulose as a high-molecular polymer with a mobile, plastic structure, easily changed under the influence of various factors. The dependence of the conditions of low-temperature treatment of cellulose on the absorption, hydrophilicity and structure of cellulose fiber is established from the standpoint of the thermodynamic method. Optimum conditions are revealed conditions of freezing wet cellulosic fibers to improve the hydrophilicity and ability formation of links of cellulose. The minimum water content under different conditions of low-temperature treatment of cellulose for the formation of water clusters and ice formation was established. The results of the density measurements by the gradient column method and the sorption of the direct green trisazo dye are consistent with the regularities found in the measurement of the enthalpy of wetting and sorption isotherms.
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