Abstract
Fibres based on the aromatic rigid-chain polyamides PABI/PPTA, PABI/PPTA-Cl, and PABI/PPTA-Cl/PPTA with a strength of 130–150 cN/tex were fabricated by spinning from LC sulfuric acid solutions through an air gap, demonstrating the induced elastic character of deformation with tensile stress greater than 50 cN/tex. The fibres obtained can be strengthened significantly as a results of heat treatment, and the best variant is preliminary thermal drawing at 90–175°C with subsequent heat treatment without tension. This heat treatment increases the strength of the fibres to 240–266 cN/tex and the modulus of elasticity to 145 GPa.
Published Version
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