FIELD: chemistry.
SUBSTANCE: polymer is soluble in a polar organic solvent and is modified in said solvent by an amine-based compound and an oxidising agent. The polymer has a structure which gives signals in the region of 150-200 h/million, determined via 13C-NMR, where the orientation of molecules according to measurement results obtained via wide-angle diffraction of X-ray radiation is 65% or higher, and specific weight is equal to or greater than 1.35.
EFFECT: fibre has high fire-resistance and strength retention value.
2 cl, 5 dwg, 30 ex
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