FIELD: chemistry.
SUBSTANCE: invention relates to chemical engineering of fibre polymer materials and yarns and fibres, consisting of copolymer fibres, and methods for preparing them. Yarn comprising copolymer derived from copolymerisation of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole, and terephthaloyl dichloride, wherein ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to moles of para- phenylenediamine is 30/70 to 85/15; said yarn having a sulphur content greater than 0.1 % and having an effective polymer cation to sulphur content molar ratio of at least 0.3, additional aspects of present invention relates to methods of producing said types of yarn.
EFFECT: invention provides an efficient method of producing copolymer fibres with improved physical properties.
13 cl, 2 dwg, 2 tbl, 5 ex
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