Journal
EUROPEAN POLYMER JOURNAL
Volume 114, Issue -, Pages 353-360Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2019.02.032
Keywords
Hydroxypropylcellulose; Ionic liquids; Rheo-NMR; Rheology; High resolution magic angle spinning; Molecular interactions
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Funding
- FCT - Fundacao para a Ciencia e a Tecnologia, Portugal [PTDC/EPH-PAT/0224/2014, PTDC/FIS-NAN/0117/2014, PTDC/QUI-QFI/31508/2017, PTNMR 22161]
- Ministry of Science, Technology and Higher Education, Portugal
- European Social Funds
- FCT [SFRH/BD/133447/2017]
- FEDER funds through the COMPETE 2020 Program, Portugal
- National Funds through FCT [POCI-01-0145-FEDER-007688, UID/CTM/50025]
- MINECO - Ministry of Economy, Industry and Competitiveness, Spain [IJCI-2015-26432]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS-NAN/0117/2014, PTDC/QUI-QFI/31508/2017, PTDC/EPH-PAT/0224/2014, SFRH/BD/133447/2017] Funding Source: FCT
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The demand for better cellulose solvents has driven the search for new and improved materials to enable the processing of this polysaccharide. Ionic liquids have been debated for a long time as interesting alternatives, but the molecular details on the solubilization mechanism have been a matter of controversy. Herein, for the first time, the structure and dynamics of hydroxypropylcellulose (HPC) liquid crystal solutions were probed in the presence of imidazolium ionic liquids (ILs), conjugating rheological measurements with magnetic resonance spectroscopy. This study provides a characterization of the solutions macroscopic behaviour, where the liquid crystalline (LC) properties were maintained. Using Its with different side chain lengths, the influence of the hydrophobic IL domain in the solvation abilities of ILs towards a cellulose derived polymer was accessed, providing experimental evidence on these interactions.
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