Conclusions
The aging of concentrated spinning solutions of PM PAA polyamido acid has been investigated with the use of viscosimetry, exclusion liquid chromatography, and rheology.
It has been found that the aging of PAA solutions is accompanied by reactions of further polycondensation and of transamidation. These reactions lead to a decrease in the polydispersity index and in structure-formation in the solution, which also causes the observed nonparallel change in intrinsic and effective viscosities of PAA solutions in the initial stages of the process.
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Additional information
Translated from Khimicheskie Volokna, No. 3, pp. 15–17, May–June, 1987.
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Karchmarchik, O.S., Yakopson, S.M., Kuznetsova, G.B. et al. Aging of spinning solutions of PM polyamido acid. Fibre Chem 19, 177–180 (1988). https://doi.org/10.1007/BF00543844
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DOI: https://doi.org/10.1007/BF00543844