Shear and Extensional Rheology of Cellulose/Ionic Liquid Solutions
Author(s)
Haward, Simon J.; Sharma, Vivek; Butts, Craig P.; Rahatekar, Sameer S.; McKinley, Gareth H
DownloadMcKinley_Shear and extensional.pdf (3.723Mb)
PUBLISHER_POLICY
Publisher Policy
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Terms of use
Metadata
Show full item recordAbstract
In this study, we characterize the shear and extensional rheology of dilute to semidilute solutions of cellulose in the ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIAc). In steady shear flow, the semidilute solutions exhibit shear thinning, and the high-frequency complex modulus measured in small amplitude oscillatory shear flow exhibits the characteristic scaling expected for solutions of semiflexible chains. Flow curves of the steady shear viscosity plotted against shear rate closely follow the frequency dependence of the complex viscosity acquired using oscillatory shear, thus satisfying the empirical Cox–Merz rule. We use capillary thinning rheometry (CaBER) to characterize the relaxation times and apparent extensional viscosities of the semidilute cellulose solutions in a uniaxial extensional flow that mimics the dynamics encountered in the spin-line during fiber spinning processes. The apparent extensional viscosity and characteristic relaxation times of the semidilute cellulose/EMIAc solutions increase dramatically as the solutions enter the entangled concentration regime at which fiber spinning becomes viable.
Date issued
2012-05Department
Massachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Hatsopoulos Microfluids LaboratoryJournal
Biomacromolecules
Publisher
American Chemical Society
Citation
Haward, Simon J., Vivek Sharma, Craig P. Butts, Gareth H. McKinley, and Sameer S. Rahatekar. Shear and Extensional Rheology of Cellulose/Ionic Liquid Solutions. Biomacromolecules 13, no. 5 (May 14, 2012): 1688-1699.
Version: Author's final manuscript
ISSN
1525-7797
1526-4602