Abstract
The densimetric characteristics of solutions and fibers are obtained and analyzed for two aromatic poly(amides) poly(p-phenylene terephthalamide) and a copolymer composed of poly(p-phenylene terephthalamide) and poly(amide benzimidazole) units. For poly(p-phenylene terephthalamide) solutions in sulfuric acid in the concentration interval ranging from 3 to 19 wt %, the linear concentration dependences of density show the points of discontinuity, which correspond to the concentration boundaries of phase states: liquid crystalline and crystal solvate states. Under all of the processing conditions under study, Armos fibers are characterized by a low level of overall maximum porosity. This factor seems to be advantageous from the viewpoint of strength characteristics and other unique properties of fibers.
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