Effect of Cellulose Pulp Type on the Mercerizing Behavior and Physical Properties of Lyocell Fibers

Author:

Chae D.W.1,Choi K.R.1,Kim B.C.1,Oh Y.S.2

Affiliation:

1. Division of Chemical Engineering, Hanyang University, Seongdong, Seoul 133-791, South Korea

2. Hanil Synthetic Fiber Co., Ltd., Kyong Nam 630-791, South Korea

Abstract

Various crimped lyocell fibers are spun from isotropic dopes of cellulose solutions in N-methyl morpholine N-oxide (NMMO) monohydrate with different compositions of hard wood and softwood pulp (IPS lyocell fibers). The physical properties of IPS lyocell fibers treated with NaOH aqueous solutions are compared with those of commercially available Tencel lyocell fibers, which are obtained by anisotropic phase spinning. WAXD reveals that pulp composition has little effect on crystalline structure, and IPS lyocell fibers yield a crystalline structure almost the same as that of Tencel fibers (cellulose II structure). Alkali treatments affect physico-mechanical properties such as compaction and tensile proper ties. Mercerization with 10 wt% NaOH solution causes the largest weight loss and the highest degree of swelling. Lyocell fibers show a notable decrease in tensile strength when treated with strong alkali solutions higher than 7.5 wt%. In addition, IPS lyocell fibers with more softwood content display less reduction in tensile properties after strong alkali treatments.

Publisher

SAGE Publications

Subject

Polymers and Plastics,Chemical Engineering (miscellaneous)

Reference21 articles.

1. Berger, W. "Possibilities and Limitations of Alternative Processes for the Dissolution and Forming of Cellulose," Lenzinger Berichte, Rudolstat, Germany, 1994, pp. 11-18.

2. Physical Properties of Lyocell Fibers Spun from Isotropic Cellulose Dope in NMMO Monohydrate

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