Research Data Leeds Repository

Data for Rheological and NMR Studies of Cellulose Dissolution in the Ionic Liquid BmimAc

Ries, Michael (2021) Data for Rheological and NMR Studies of Cellulose Dissolution in the Ionic Liquid BmimAc. University of Leeds. [Dataset] https://doi.org/10.5518/978

Dataset description

Solutions of two types of cellulose in the ionic liquid 1-butyl-3-methyl-imidazolium acetate (BmimAc) have been analyzed using rheology and fast-field cycling (FFC) NMR spectroscopy, in order to analyze the macroscopic (bulk) and microscopic environments respectively. The degree of polymerization (DP) was observed to have a significant effect on both the overlap (c*) and entanglement (ce) concentrations, as well as the intrinsic viscosity ([η]). For microcrystalline cellulose (MCC)/BmimAc solutions, [η] = 116 mL g-1 which is comparable to MCC/1-ethyl-3-methyl-imidazolium acetate (EmimAc) solutions, whilst [η] = 350 mL g-1 for the commercial cellulose (higher DP). Self-diffusion coefficients (D) obtained via the model-independent approach were found to decrease with cellulose concentration and increase with temperature which can in part be explained by the changes in viscosity, however ion interactions on a local level are also important. Both Stokes-Einstein and Stokes-Einstein-Debye analysis were carried out to directly compare rheological and relaxometry analysis. It was found that polymer entanglements affect the microscopic environment to a much lesser extent than the macroscopic environment. Finally, the temperature dependencies of η, D and relaxation time (T1) could be well described by an Arrhenius relationship and thus activation energies (Ea) for flow, diffusion and relaxation were determined. We demonstrate that temperature and cellulose concentration have a different effect on short and long-range interactions.

Divisions:	Faculty of Engineering and Physical Sciences > School of Physics and Astronomy
Related resources:	Location Type https://doi.org/10.1021/acs.jpcb.1c02848 Publication
License:	Creative Commons Attribution 4.0 International (CC BY 4.0)
Date deposited:	12 Jul 2021 15:09
URI:	http://archive.researchdata.leeds.ac.uk/id/eprint/868
Additional details Additional details Creators: Creators ORCID Other ID Email Primary affiliation Primary affiliation ID Primary affiliation ID type Secondary affiliation Secondary affiliation ID Secondary affiliation ID type Ries, Michael https://orcid.org/0000-0002-8050-3200 University Of Leeds https://ror.org/024mrxd33 ROR Type of data: Dataset Research funders: EPSRC Grant numbers: EP/S023631/1 Publication date: 2021 Resource language: English Research project title: Rheological and NMR Studies of Cellulose Dissolution in the Ionic Liquid BmimAc Publisher: University of Leeds Last Modified: 12 Jul 2021 22:35

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