Investigation of mixed polymeric liquid-crystal systems

Conclusions The temperature regions of fusion and viscosity of mixed liquid-crystals based on PPTA have been investigated.On appropriate selection of the copolymers, mixtures of polymers, or mixed solvents, it is possible to vary the temperature of transition of these systems from the solid state to the liquid one over a wide range.Translated from Khimicheskie Volokna, No. 3, pp. 19–21, May–June, 1983.     

Removal of ammonia from tarry water using a tubular furnace

An ammonia-processing system without the use of live steam from the plant’s supply network is considered. Steam obtained from the wastewater that leaves the ammonia column is used to process the excess tarry water, with the release of volatile ammonia.     

Effect of the chemical structure of introduced polymers on the properties of poly-p-phenyleneterephthalamide solutions

Conclusions The effect of the chemical structure of a polymer introduced into a liquid crystal solution of PPTA on some properties of the solutions has been found.Aliphatic and aromatic polyamides exert the least action on these properties as compared with polymers of other classes.Translated from Khimicheskie Volokna, No. 4, pp. 39–40, July–August, 1984.