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Influence of water on phase transition and rheological behavior of cellulose/ionic liquid/water ternary systems
- Influence of water on phase transition and rheological behavior of cellulose/ionic liquid/water ternary systems
- Lee, Young Jae; Kwon, Mi Kyung; Lee, Sung Jun; Jeong, Sang Won; Kim, Hyun Chul; Oh, Tae Hwan; Lee, Se Geun
- DGIST Authors
- Lee, Sung Jun; Jeong, Sang Won; Kim, Hyun Chul; Lee, Se Geun
- Issue Date
- Journal of Applied Polymer Science, 134(22)
- Article Type
- Article in Press
- Association Reactions; Cellulose; Cellulose and Other Wood Products; Chain Entanglements; Complex Networks; Creep; Crystalline Materials; Gels; Hydrogen Bonds; Influence of Water; Intra- and Intermolecular Hydrogen Bonds; Microcrystalline Cellulose; Phase Behavior; Polarized Optical Microscopy; Rheological Behaviors; Rheology; Storage and Loss Modulus; Visco-Elastic Behaviors; Wood
- 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.
- John Wiley and Sons Inc.
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- Magnet-Controlled Materials Research Group1. Journal Articles
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