Rheological and NMR Studies of Cellulose Dissolution in the Ionic Liquid BmimAc
نویسندگان
چکیده
Solutions of two types cellulose in the ionic liquid 1-butyl-3-methyl-imidazolium acetate (BmimAc) have been analyzed using rheology and fast-field cycling nuclear magnetic resonance (NMR) spectroscopy, order to analyze macroscopic (bulk) microscopic environments, respectively. The degree polymerization (DP) was observed a significant effect on both overlap (c*) entanglement (ce) concentrations intrinsic viscosity ([?]). For microcrystalline (MCC)/BmimAc solutions, [?] = 116 mL g–1, which is comparable that MCC/1-ethyl-3-methyl-imidazolium (EmimAc) while 350 g–1 for commercial (higher DP). Self-diffusion coefficients (D) obtained via model-independent approach were found decrease with concentration increase temperature, can part be explained by changes viscosity; however, ion interactions local level are also important. Both Stokes–Einstein Stokes–Einstein–Debye analyses carried out directly compare rheological relaxometry analyses. It polymer entanglements affect environment much lesser extent than environment. Finally, temperature dependencies ?, D, relaxation time (T1) could well described Arrhenius relationships, thus, activation energies (Ea) flow, diffusion, determined. We demonstrate different effects short- long-range interactions.
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ژورنال
عنوان ژورنال: Journal of Physical Chemistry B
سال: 2021
ISSN: ['1520-6106', '1520-5207']
DOI: https://doi.org/10.1021/acs.jpcb.1c02848