INVESTIGATION OF POLYMERIZATION DEGREE OF HIGHLY DISPERSED CELLULOSE-BASED MODIFIER FOR CONSTRUCTION COMPOSITES

The present article established the degree of cellulose raw material polymerization, factory microcrystalline cellulose and highly dispersed cellulose obtained under laboratory conditions by oxidative degradation, employing methods of viscometric determination of changes in the kinematic viscosity of a copperammonia solution and iodometric titration. The effect of oxidative degradation is based on short-term formation of hydroxyl radicals (•OH) in reaction mixture, and consists of processing of crushed filter paper with glacial acetic acid for 60 minutes in the presence of hydrogen peroxide solution and copper (II) sulfate at temperature of 115 ° C. The application priority areas of these methods have been identified in terms of indicator effect on analysis results, as well as the heterogeneous oxidation reaction effectiveness of aldehyde groups under conditions of high dispersion. Their reference value for construction materials science is focused in the context of reproduction availability and ease of analysis alongside with sufficient reliability and accuracy of measurements, which is confirmed by the data of a relative discrepancy not exceeding 5%. The research showed that polymerization degree of microcrystalline cellulose and hydrosol of highly dispersed cellulose being relative to the least soluble cotton raw materials is 7 and 40 times lower, respectively. It demonstrates the effectiveness of the chosen solution and can serve as intensity indicator of physical and chemical destruction of fibers during micro- and nanocellulose production.