Effects of coagulation conditions on properties of multifilament fibers based on dissolution of cellulose in NaOH/urea aqueous solution

Yuan Mao, Lina Zhang, Jie Cai, Jinping Zhou, Tetsuo Kondo

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19 Citations (Scopus)

Abstract

Effects of coagulation temperature, coagulants, and wet-spinning methods on structure and properties of novel regenerated cellulose (RC) fibers prepared from cellulose in 7.5 wt % NaOH/11 wt % urea aqueous solution on pilot scale spinning machine by one- and two-stage coagulation were investigated by tensile testing, optical microscopy, scanning electron micrograph, and wide-angle X-ray diffraction. The results indicated that H2SO4/Na 2SO4 and H2SO4 aqueous solutions are potential coagulants for NaOH/urea system and fibers wet-spun from the two-stage coagulation obviously exhibited the better mechanical properties than those from the one-stage coagulation. The optimal coagulation conditions for two-stage coagulation are 10 wt % H2SO4/15 wt % Na 2SO4 for the first coagulation bath and 5 wt % H 2SO4 for the second bath or 5 wt % H2SO 4/15 wt % Na2SO4 for the first coagulation bath and 10 wt % H2SO4 for the second bath. Moreover, the tensile strength of novel fibers increased with a drop in coagulation temperature. The diffusion rate between the coagulant and solvent plays a major role in determining the mechanical properties of the cellulose fibers. Our spinning process was quite different from that of the viscose process, in which orientation and coagulation proceed more or less simultaneously. The production method of this fiber wet-spun could be suitable in the wide range of coagulation conditions, compared to the viscose one.

Original languageEnglish
Pages (from-to)8676-8683
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume47
Issue number22
DOIs
Publication statusPublished - Nov 19 2008

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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