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

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.

Fibrillation Tendency of Cellulosic Fibers. Part 1: Effects of Swelling

“…(Bredereck et al 2003;Toth et al 2003). Many reports on the morphological structure of man-made cellulosic fibers and their treatment with crosslinking agents have been published (Nicolai et al 1998;Chae et al 2003;Zhang et al 2003). However, few studies of the fibrillation tendency of man-made cellulosics have been conducted in alkali solution under different conditions.…”

The design and testing of a dual fiber textile matrix for accelerating surface hemostasis

“…As is the case with many regenerated cellulosic fibers, the properties of bamboo viscose rayon are to some extent dependent on the pulp composition, e.g., hemicellulosic content, but these relationships are not clearly defined. 49,50 Bamboo viscose is morphologically similar to conventional viscose. The cross-section has an irregular “popcorn” shape and longitudinal striations with long surface cracks characterize the surface.…”

“…The hydrophilic nature of specialty rayon probably plays an important role in driving these three processes. As is the case with many regenerated cellulosic fibers, the properties of bamboo viscose rayon are to some extent dependent on the pulp composition, e.g., hemicellulosic content, but these relationships are not clearly defined 49, 50. Bamboo viscose is morphologically similar to conventional viscose.…”

Development of a method for obtaining sorbent from bagasse of sweet sorghum for neutralization of soil contamination by heavy metal ions

“…When processing waste plant materials with alkali, partial destruction of molecular bonds between biopolymer fibers and transition of low molecular weight polysaccharide fractions is observed, the structural frame of the lignocellulosic matrix is preserved, and its ability to swell increases [16]. An important change from the point of view of sorbent production is that while preserving the integrity, the plant fibers improve their structurally porous structure by increasing the internal adsorption surface [17,18].…”