Desized and scoured nylon 6 fabric is treated with liquid ammonia (NH3) at -33.4°C. and the effects of the treatment on crystallinity, density, birefringence, DSC thermogram, moisture regain, water absorption, dyeability, and mechanical properties are investigated. The NH3 treatment increases crystallinity and density, but decreases birefringence and water absorption. Although α- and γ-forms coexist in untreated fibers, the γ-form is partially transformed to the α-form by the NH3 treatment, a result that is confirmed by DSC measurements. The NH3 treatment increases crystallinity, dyeing rate, and equilibrium dye uptake, especially with disperse dyes. Mechanical properties of NH3 treated nylon 6 fabric, KES shearing (G, 2HG, and 2HG5), and bending hysteresis (B and 2HB) are measured. G, 2HG, 2HG5. B, and 2HB decrease with the treatment. From this result, it is clear that the NH3 treatment improves the hand of nylon 6 fabric.
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