Physical properties and fibrillation tendency of regenerated cellulose fiber dry jet-wet spun from high-molecular weight cotton linter Pulp/NMMO solution

摘要

This article describes an efficient method for suppressing fibrillation in as-spun regenerated cellulose fiber prepared using high molecular weight (DP 1600) cotton linter pulp/NMMO solution as the starting materials via Lyocell process. The regenerated cellulose fibers were spun using a custom-made lab scale dry jet-wet spinning apparatus, and their physical properties such as birefringence, crystallinity, orientation and lateral order indices, and fibrillation tendency were investigated. Further, the relationship between chain orientation and fibrillation tendency in the cellulose fibers were discussed as a function of varying molecular weights (DP 1000, 1600, and 1600/1000 (95/5) mixture), dope concentrations (6-13 wt%) and take-up speed (10, 30, and 50 m/min). Regenerated cellulose fibers spun from high molecular weight cotton linter pulp (DP 1600) at lower dope concentrations (6-8 wt%) exhibit least fibrillation behavior, whereas the cellulose fibers spun from higher dope concentration (9 wt%) using low molecular weight cotton linter pulp (DP 1000) as well as the mixture (DP 1600/1000 (95/5)) exhibited considerable amount of fibrillation. The results are reported in detail.