THE INFLUENCE OF SURFACE DESTRUCTION ON THE HYDROPHILICITY AND ABILITY TO FORM CONNEC-TIONS OF THE CELLULOSE FIBERS
UDC 676.026
Abstract
When using cellulose fibers to produce paper, the main role is played by the state of the surface of the fiber and its ability to adhesive-cohesive interaction. The main indicators characterizing the surface of the fiber are development and roughness, chemical heterogeneity, depending on the presence of various functional groups, as well as structural heterogeneity of the surface layers, leading to the formation of a stronger bond between the fibers. The surface modification of the fiber was carried out by partial acid hydrolysis. The study is aimed at optimizing hydrolysis, choosing methods for its control, obtaining physicochemical and physicomechanical characteristics of partially hydrolyzed cellulose, and increasing the ability to bind cellulose fiber. A method has been developed for producing modified cellulose with improved adhesion-cohesive properties by surface destruction of wet cellulose fibers during hydrolysis. The patterns of activation of the surface properties of cellulose fibers are obtained. The effect of partial acid hydrolysis on the development of the surface of the fiber in the absence of "wet" grinding with water shortage is shown. The effect of short chains and reducing carbonyl groups of cellulose macromolecules on the binding capacity of modified cellulose has been established. The optimal content of short chains of cellulose macromolecules, which is 12%. Such a content of short chains of modified fibers by acid hydrolysis was detected at a temperature of 363 K and an exposure time of 40 s; under these optimal conditions, the strength of the experimental castings increases by 70%.
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