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Analysis of regenerated cellulose fibers with ionic liquids as a solvent as spinning speed is increased

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Abstract

In order to improve the spinning efficiency, the spinning experiments with cellulose/1-butyl-3-methylimidazolium chloride solution were done whilst increasing spinning speed. It was found that the tenacity and initial modulus of regenerated cellulose fibers increased but the elongation at break decreased slightly with increasing spinning speed at constant draw ratio. Further, the synchrotron wide-angle X-ray diffraction and small-angle X-ray scattering were carried out to illustrate the relationship between the structure and the mechanical properties. It was shown that the crystal orientation, crystallinity, amorphous orientation factor as well as orientation of the microvoids along the fiber increased with the spinning speed as the diameter of the microvoids in the fiber decreased. From the analysis of the spinline stress, it is clear that the spinline stress increased when both extruding and draw speed increased at constant draw ratio. This resulted in the improvement of supramolecular structure and mechanical properties of the regenerated cellulose fibers.

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Acknowledgments

The work was supported by a grant from National Natural Science Foundation of China (50873025), Shanghai Leading Academic Discipline Project (B603), the Innovation Funds for PhD Students (Jiang Guansen) of Donghua University, and Basal Research Operation Cost Special Foundation of Central University. WAXD and SAXS experiments were performed at U7B Beamline station in the National Synchrotron Radiation Laboratory (NSRL) and 16B1 Beamline station in Shanghai Synchrotron Radiation Facility (SSRF), respectively.

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Correspondence to Yumei Zhang.

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Jiang, G., Yuan, Y., Wang, B. et al. Analysis of regenerated cellulose fibers with ionic liquids as a solvent as spinning speed is increased. Cellulose 19, 1075–1083 (2012). https://doi.org/10.1007/s10570-012-9716-2

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