Activation parameters of viscous flow of guar gum and its cross-linked system
Аннотация
The structure of a cross-linked form of a concentrated solution of guar gum was studied using IR spectroscopy. The processes of viscous flow of concentrated solutions of guar gum and its cross-linked system have been studied. It is shown that this system is a non-Newtonian fluid with a thixotropic type of viscous flow anomaly, which is also determined by the nature of the complexing agent. The influence of temperature on viscous flow processes, as well as the structure of aqueous systems of guar gum and its cross-linked form, were studied based on the average statistical sizes of kinetic units, which makes it possible to estimate the mobility of structural elements and their sizes for concentrated systems. The activation parameters of the viscous flow of aqueous systems of guar gum and its cross-linked system were studied. Calculations of thermodynamic parameters were carried out free energy, heat of activation of viscous flow, characterizing the strength of structures, and entropy of activation of viscous flow, characterizing the ordering of structures. At high shear stresses, for the guar gum solution system, the processes of ordering and orientation prevail during flow, and for the guar gum - pentaerythritol borate system, the processes of structure destruction and disordering prevail.