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Machalaba N.N.,Scientific Research Institute of Synthetic Fibers
Fibre Chemistry | Year: 2011

We have conducted rheological studies of polymer solutions synthesized using solvents having different dielectric constants. We have determined the effect of this characteristic on the rheological properties of the spin dopes. Estimation of the strength indices of aramid fibers obtained from solutions based on solvents with different dielectric constants made it possible to identify the benchmark value for the dielectric constant. © 2011 Springer Science+Business Media, Inc. Source


Koval' Y.S.,Scientific Research Institute of Synthetic Fibers
Fibre Chemistry | Year: 2011

Systems of differential equations in cartesian and cylindrical coordinates are obtained to describe a flexible filament rotating in a resisting medium. The concept of the unit aerodynamic drag coefficient of the filament is introduced in addition to the assumptions used in previous studies. The systems of differential equations that were obtained are solved in analytical form using the assumptions that were made. A value is found for the new concept of unit aerodynamic drag coefficient, and ways are described to study it and determine its value for different filaments in practical applications. Complete mathematical expressions are obtained to calculate parameters that are of practical importance in the twisting of a filament - its tension, the maximum radius (diameter) of the torsion balloon, and the conditions under which multiple balloons are formed. It is established that the problem of the form and tension of a filament during its twisting cannot be solved in final form without allowance for the resistance of the medium. © 2011 Springer Science+Business Media, Inc. Source


Isaeva V.I.,Scientific Research Institute of Synthetic Fibers | Bazarov Y.M.,Ivanovo State University | Mizerovskii L.N.,RAS Institute of Chemistry | Zakharov E.Y.,Scientific Research Institute of Synthetic Fibers | Kolobkov A.S.,Ivanovo State University
Fibre Chemistry | Year: 2011

Using different methods to study the properties of polycaproamide obtained by low-temperature hydrolytic polymerization of caprolactam and by commercial production (GrodnoKhimvolokno OAO), we have shown that the experimental samples have higher degree of oxidation and content of caprolactam and low molecular weight compounds. Since we previously established a correlation between these indices of the polymer and the strength characteristics of the filament made from it, despite the greater drawability of polycaproamide filaments obtained by low-temperature hydrolytic polymerization of caprolactam, the strength indices of the filaments formed from polycaproamide proved to be lower over the entire range of draw ratios. © 2011 Springer Science+Business Media, Inc. Source


Vinogradov Y.A.,Scientific Research Institute of Synthetic Fibers | Neverov A.P.,Scientific Research Institute of Synthetic Fibers
Fibre Chemistry | Year: 2011

The strain properties of polymer systems under shear and tension have been investigated with chemical fibers formed by the wet method. The main methods of expressing the stresses and strains are examined. It is shown that the stretching of freshly prepared fiber during the formation process is related less with the section of steady flow in a capillary and more with the sections of entry and exit from the spinneret (capillary). It is shown that the method of forming chemical fibers can be used to determine the entry and exit end corrections. © 2011 Springer Science+Business Media, Inc. Source


Mitchenko Y.I.,Scientific Research Institute of Synthetic Fibers | D'yachkov A.N.,Scientific Research Institute of Synthetic Fibers | Rudneva L.D.,Scientific Research Institute of Synthetic Fibers
Fibre Chemistry | Year: 2011

Aspects of a gel technology for obtaining polyvinyl alcohol fibers from the high-molecular-weight polymer are examined, and studies are made of the rheological and morphological characteristics of fibers formed from solutions of different concentrations. It is shown that the use of a dry-wet forming method instead of the competing methods of thermotropic transformation and wet precipitation makes it possible to obtain fibers having a strength of 2. 2 GPa and an elastic modulus of up to 32 GPa. © 2011 Springer Science+Business Media, Inc. Source

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