Effect of Hot Mercerization on Liquid Ammonia Treated Cottons
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Liquid ammonia treated cotton fiber and fabric were mercerized with 20% sodium hydroxide (NaOH) aqueous solution for 5 min at 20°C to 100°C. X-ray diffraction patterns of the cottons were measured with a Rigaku Denki III DMAX. The NH<sub>3</sub>-treated cotton fiber showed almost Cellulose III crystallite pattern. After mercerization, the crystallite phase transformed to Cellulose II<sub>III</sub> and a little Cellulose I<sub>III</sub>. On the other hand, though NH<sub>3</sub>-treated cotton fabric was changed partially to Cellulose III<sub>II</sub>, untreated Cellulose I crystallite was remained not a little. The obtained Cellulose III<sub>I</sub> crystallite of the fabric was completely returned to Cellulose I<sub>III</sub> by mercerization regardless of the temperature, Cellulose II<sub>III</sub> crystallite was not observed despite of a decreasing of the mercerizing temperature. Therefore, it seems that mercerization of the fiber and fabric is considerably different. Apparent dyeing rate of the NH<sub>3</sub>-treated cotton fiber and fabric with C.I. Direct Blue 1 was increased by the hot mercerizing. The rate of the fiber was increased with a decrease of the mercerizing temperature, whereas that of the fabric was no difference among the temperature.
- Sen'i Gakkaishi
Sen'i Gakkaishi 58(5), 185-187, 2002-05-10
The Society of Fiber Science and Technology, Japan