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Volume 6 Research & Reviews: Journal of Material Sciences MatSciEngg 2018
October 15-17, 2018
October 15-17, 2018 Helsinki, Finland
31st Materials Science and Engineering
Conference: Advancement & Innovations
Regenerated cellulose fibers spun from 1-ethyl-3-methylimidazolium diethyl phosphate/dimethyl
sulfoxide co-solvent systems
Jiaping Zhang, Keita Tominaga and Yasuo Gotoh
Shinshu University, Japan
Ionic Liquids (ILs) after reported by Swatloski, et al. in 2002 have
drawn much attention as solvents for cellulose. However, the
viscosity of cellulose/ILs solutions is relatively high, which requires
longer solubilization time leading to high cost and negative effect
on spinning. Some works about the addition of co-solvents into
cellulose/ILs solution systems have been reported aiming to reduce
the viscosity of the solutions. The addition of highly polar aprotic
solvents such as dimethylformamide and Dimethyl Sulfoxide
(DMSO) to ILs was found to possibly decrease the viscosity of
cellulose solutions. Moreover, some reports showed that co-
solvents could accelerate the dissolution of cellulose, which was
particularly favorable for cellulose processing. However, to the
best of our knowledge, there are few works concentrating on the
final properties of cellulose regenerated cellulose fibers spun from ILs/co-solvents systems. Herein, in this study, regenerated
cellulose fibers were prepared from co-solvent system consisting of a kind of imidazolium ILs, 1-Ethyl-3-Methylimidazolium
Diethyl Phosphate (EMIMDEP) and DMSO via dry-jet wet spinning. The spinnability of spinning dopes, mechanical
properties, structures and fibrillation behaviors of the regenerated fibers were investigated by comparing with pure EMIMDEP
system. The results showed that the spinnability determined by the maximum winding speed reduced to less than half of that
for cellulose/EMIMDEP solution after addition of 30 wt% DMSO. This may be derived from reduction of elongation viscosity,
which leads to decrease in strength of spinning line under elongation flow. Moreover, regenerated cellulose fibers spun from
EMIMDEP/DMSO 70/30 (wt/wt) showed lower tensile strength and Young’s modulus, but superior fibrillation resistance. This
was thought to be related to its low crystalline orientation and low degree of crystallinity.
Biography
Jiaping Zhang is a PhD student in Shinshu University, Japan. She studies mainly about the preparation of high performance regenerated cellulose fibers and ultrafine
regenerated cellulose nonwoven fabrics in the Department of Materials Science and Engineering. She belongs to global leader program for fiber renaissance, which
aims to cultivate young researchers with broader perspective, leadership and management skills.
Jiaping Zhang et al., Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C5-027
Figure-1: WAXD profiles with de-convoluted peaks
for powdered regenerated cellulose fibers spun from
EMIMDEP/DMSO solutions (100/0 (left image) and
70/30 wt/wt (right image)). X-ray fiber photographs of
aligned fibers were also put in the figures.