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Influence of water on phase transition and rheological behavior of cellulose/ionic liquid/water ternary systems

Title
Influence of water on phase transition and rheological behavior of cellulose/ionic liquid/water ternary systems
Authors
Lee, Young JaeKwon, Mi KyungLee, Sung JunJeong, Sang WonKim, Hyun ChulOh, Tae HwanLee, Se Geun
DGIST Authors
Lee, Sung JunJeong, Sang WonKim, Hyun ChulLee, Se Geun
Issue Date
2017
Citation
Journal of Applied Polymer Science, 134(22)
Type
Article
Article Type
Article in Press
Keywords
Association ReactionsCelluloseCellulose and Other Wood ProductsChain EntanglementsComplex NetworksCreepCrystalline MaterialsGelsHydrogen BondsInfluence of WaterIntra- and Intermolecular Hydrogen BondsMicrocrystalline CellulosePhase BehaviorPolarized Optical MicroscopyRheological BehaviorsRheologyStorage and Loss ModulusVisco-Elastic BehaviorsWood
ISSN
0021-8995
Abstract
The influence of water content on liquid crystalline (LC) gel formation and the rheological behavior of a ternary microcrystalline cellulose (MCC)/1-ehtyl-3-methylimidazolium acetate (EmimAc)/water system was investigated using polarized optical microscopy (POM) and rheometry. POM indicated that the distinct water content range for forming a fully anisotropic LC gel with 14 wt % MCC was 4–10 wt %. Adding water to the MCC/EmimAc system resulted in enhanced complex viscosity and storage and loss moduli, and ultimately LC gel formation. Comparison of creep compliance vs. time revealed that the system without water showed representative viscoelastic behavior, while the time dependence of creep compliance disappeared as the water content increased, suggesting elastic-solid behavior. Additionally, hydrogen bonding between cellulose and EmimAc weakened as water content increased, whereas the intra- and intermolecular hydrogen bonds of cellulose became stronger because of strong self-association. This strong bonding caused aggregation, chain entanglement, and self-supporting LC gel network formation. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44658. © 2017 Wiley Periodicals, Inc.
URI
http://hdl.handle.net/20.500.11750/5046
DOI
10.1002/app.44658
Publisher
John Wiley and Sons Inc.
Related Researcher
Files:
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Collection:
Magnet-Controlled Materials Research Group1. Journal Articles


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