Wet spinning of acrylic microfibres
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Polyacrylonitrile microfibres with a linear density of 0.02–0.10 tex can be manufactured by wet spinning into spinning baths with a low concentration of precipitant. When the jets of spinning solution come into contact with such a spinning bath, a concentration of precipitant lower than the threshold concentration where coagulation does not take place is established on the surface of the fibre for a short time (0.02–0.56 sec). The spun fibres have a liquid segment longer than the stressed part of the jet exposed to normal stresses. Fibres with a liquid segment can be drawn by 5–10 times, which allows fabricating microfibres with a linear density of 0.02–0.10 tex having a strength of 45–80 cN/tex and elongation of 15–20%. Fibres spun into baths with a low concentration of precipitant have high porosity, which could be attributed to formation of a liquid polymer phase in phase decomposition of the spinning solution.
KeywordsPolymer Porosity Organic Chemistry Normal Stress High Porosity
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