FIELD: chemistry.
SUBSTANCE: aromatic polyamide fibres, containing a heterocycle-containing aromatic polyamide, undergoes thermal treatment in conditions with oxygen content of 1 vol. % or less after stretching. The aromatic polyamide fibres are characterised by tensile strength of 20 cN/dtex or higher, initial modulus of 500 cN/dtex or higher, and the amount of substance dissolved in sulphuric acid equal to or less than 45%.
EFFECT: disclosed heterocycle-containing aromatic polyamide fibres demonstrate an excellent balance between tensile strength, initial modulus and strength in a direction perpendicular the axis of the fibre, are characterised by high strength retention coefficient under heat and moisture conditions and excellent fire-resistance, bullet-proof properties and cutting resistance.
11 cl, 1 tbl, 12 ex
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