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Cellulose

, Volume 12, Issue 3, pp 267–273 | Cite as

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

  • Wangsun Zhang
  • Satoko Okubayashi
  • Thomas Bechtold
Article

Abstract

The fibrillation tendencies of various cellulosic fibers in aqueous solution containing alkali metal hydroxide and ethanol were evaluated with two specific parameters: the critical point of fibrillation (CPFconc.), that is a concentration of swelling agent where the fibrillation begins, and the ratio of initial increase in fibril number to increase in concentration of swelling agent (I i ). The CPFconc. and the I i are defined as fibrillation stability and fibrillation sensitivity to swelling agent, respectively. Lyocell fiber (CLY1) has the smallest CPFconc. and the largest I i , representing the lowest fibrillation stability and the highest fibrillation sensitivity, leading to the highest fibrillation tendency in CLY1 among the fibers tested. Although crosslinking improved fibrillation stability in lyocell as compared to modal, the fibrillation stability remained higher owing to the high water capacity and the high affinity for alkali. In alkali solution at the same concentration CLY1 fibrillation increased in the order of LiOH  > NaOH  > KOH. However, the plot of fibril number against solvent retention value of CLY1 in different alkaline solutions gives a slope of 110 count · g/cm3 regardless of alkali type, the critical degree of swelling for CLY1 with no fibrillation was 0.62 cm3/g in alkali solutions and 0.45 cm3/g in ethanol/water mixture.

Keywords

Alkali metal hydroxide Ethanol Fibrillation Lyocell Solvent retention capacity Swelling Viscose 

Nomenclature

Ww

weight of fibers after centrifugation (g)

Wd

weight of fibers after drying (g)

Dalk.

density of alkaline solution (g/cm3)

ARV

solvent retention value in alkaline solution (cm3/g)

WRV

solvent retention value in water (cm3/g)

ERV

solvent retention value in ethanol/water mixture (cm3/g)

Ii

initial increase in fibril number (count · l/mol)

Vp

pore volume (cm3/g)

CPCconc.

critical point of fibrillation (mol/l)

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Copyright information

© Springer 2005

Authors and Affiliations

  • Wangsun Zhang
    • 1
  • Satoko Okubayashi
    • 1
  • Thomas Bechtold
    • 1
  1. 1.Christian-Doppler Laboratory of Textile and Fiber Chemistry of Cellulosics, Institute of Textile ChemistryTextile Physics of Leopold-Franzens-University InnsbruckDornbirnAustria

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