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ИК-спектры поливинилхлоридных волокон во многих случаях имеют аналогичные полосы поглощения, но отдельные их разновидности, например, перехлорированные поливинилхлоридные и сополимерные волокна (ПОЛНВИНМЛХЛОР‹НД + ацетат целлюлозы) имеют специфичеокне полосы поглощения, что позволяет отличать их друг от друга.

Polyacrylonitrile fibres, often shortly called polyacrylic fibres, are known under several hundred trade names. The world output of synthetic polyacrylic fibres has attained the third place after polyester and polyamide fibres.According to the recommendation 2076 1973 of the International Standardization Organization (ISO), polyacrylic fibres are synthetic fibres formed from such high polymers which have been linearly polymerized from at least 85% of vinyl cyanide/acrylonitrile f l ]. Modacrylic fibres are synthetic fibres formed by linear polymerization from less than 85 wt. %, but more than 50 wt. % of acrylonitrile. In the ISO's recommen-

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