Dyeing and Mechanical Properties of Ramie Fabric Treated with Liquid Ammonia

摘要

Desized and scoured ramie fabric was treated with liquid ammonia (NH_3) using a practical range. Crysllinity moisture regain, water absorption, and dyeing properties were measured to investigated the internal structure of the fiber by the NH_3 trestment. Crystallite structure of ramie cellulose I was transformed to cellulose III the NH_3 treatment. Crystallinity was decreased not only by the NaOH but also by the NH_3 treatment. Early dyeing rate of the fabric was increased considerably with NaOH treatment, while it decreased greatly with the NH_3 and NaOH/NH_3 treatment. Nevertheless equilibrium dye uptake was increased a little by the NH_3 treatment . As a measure of fabric hand, shearing and bending hysteresis curves were obtained using KES insturment. Shearing modulus G, bending hysteresis width 2HG, bending modulus B and bending hysteresis within 2HB obvioulsy decreased by the NH_3 and NaOH/NH_3 treatments