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Effects of heat treatment on dyeability, glass transition temperature, and tensile properties of polyacrylonitrile fibers

Acrylic filament fibers (Orlon 42 tow) were subjected to a series of heat treatments consisting of dry heat at 110 and 150 ° C and saturated steam at 110 ° C for a period of 5 min; samples were exposed both under tension of 2.2×10 −3 N/tex (0.025 g/denier) and slack (no tension). Following the heat treatments, denier, tenacity, elongation, initial modulus, glass transition temperatures (T g ), the ratio of the intensities of the CN/CH stretching bands, and dye uptake were measured. Physical properties were found to be affected primarily by the presence or absence of tension during heat treatment. That is, the temperature of dry heat and the presence or absence of moisture at 110 ° C had less of an effect than tension