Phase equilibrium, structure, and rheological properties of the carboxymethyl cellulose-water system

The phase transitions, structure, and rheological properties of the carboxymethyl cellulose-water system were studied via the turbidity-point method, viscometry, polarization microscopy, and the turbidityspectrum method as well as with a polarization photoelectric unit. The regions of existence of the isotropic and anisotropic phases, the gel point, and the concentration dependence of the supramolecular-particle size were determined. Magnetic-field application results in a gain in the viscosities of carboxymethyl cellulose solutions. © 2013 Pleiades Publishing, Ltd

Влияние Магнитного Поля На Реологические Свойства Растворов Эфиров Целлюлозы

The rheological properties, structure and phase transitions of hydroxypropyl cellulose in ethanol, dimethyl sulfoxide, ethylene glycol solutions and ethylcellulose in dimethylformamide so-lutions are studied using viscometry, the cloud-point method, polarization microscopy, the optical interferometry and a polarization photoelectric apparatus in the temperature range 280-360 K. The temperature-concentration regions of isotropic and anisotropic phases are determined for all sys-tems. The type of boundary curves of phase diagrams is compared with the chemical structure of macromolecules. It is shown that the constant magnetic field (3.6 kOe) leads to the orientation of macromolecules in solutions. The domain structure arising in solutions is fixed after evaporation of a solvent and shown in orientation of strips of the film relief. It was found that the flow curves of all solutions at 298 K in the range of shear rates from 0 to 15 s-1 are typically for the non-Newtonian liquids. It was found that the magnetic field leads to an increase in the viscosity of isotropic solutions and a decrease in the viscosity of anisotropic solutions. Both effects depend on the direction of the magnetic field lines. When the rotor-rotation axis is parallel to the direction of power lines of the magnetic field the change in the viscosity of solutions is greater than that at perpendicular orientation of the rotor-rotation axis and power lines of the magnetic field. The re-sults are discussed using representations about the changes in the macromolecule conformation and in the size and shape of the supramolecular particles in the solutions during flow under a magnetic field with different orientation of the power lines © 2021, ChemChemTech. All Rights Reserved

PHASE TRANSITIONS OF SOLUTIONS OF NATURAL POLYELECTROLITES IN THE MAGNETIC FIELD

These studies are devoted to the study of phase transitions of the gelatin-water system. Gelatin is a natural polyelectrolyte. The author has discovered that the magnetic field affects the gelation process

PUSH-PULL HETEROSTYRENES ON PYRROLE-, INDOLE-, FURAN-, AND BENZOFURAN-BASED MATRICES

This work was supported by Russian Science Foundation (project 22-23-00505)