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Yaroslavskiy, Russia

Iovleva M.M.,OOO Lirsot | Banduryan S.I.,OOO Lirsot
Polymer Science - Series A | Year: 2010

The progress in phase equilibria of polymer-solvent systems is briefly reviewed. The features of phase diagrams intended for production of fibers with high strength, deformation, and thermal properties are considered. Some attention is given to the fundamental role of S.P. Papkov in the creation and development of scientific concepts on phase equilibria in fiber-forming polymers involving solvents. © 2010 Pleiades Publishing, Ltd. Source

Volokhina A.V.,OOO Lirsot | Kiya-Oglu V.N.,OOO Lirsot | Lukasheva N.V.,OOO Lirsot | Sokira A.N.,OOO Lirsot | And 2 more authors.
Polymer Science - Series A | Year: 2010

A new aramid fiber designed for the fabrication of heat-and-fire-resistant textile products is synthesized. The chemical structure of the initial polymer is a copolymer based on three aromatic diamines-5(6)-amino-2-(p-aminophenyl) benzimidazole, m-phenylenediamine, and p-phenylenediamine-and terephthaloyl chloride. The synthesis of this copolymer and its main features are described. The new fibers are characterized by higher resistance to fire and higher hygroscopicity than the known m-aramid fibers. This circumstance is due to the presence of benzimidazole heterocycles in the molecular chains of aramid. In contrast to m-aramid fibers, the undesirable step of thermal strengthening can be excluded in the manufacture of the new fiber, since it is characterized by high strength and high stability against heat shrinkage in the as-spun state. These properties are due to the semi-rigid-chain character of the initial copolyamide. According to Papkov's concepts, the phase transition into the ordered liquid-crystalline state can proceed in these polymers during the spinning of fiber at the stage of polymer precipitation. © 2010 Pleiades Publishing, Ltd. Source

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