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Cellulose dissolution: Comparison of two non-derivatizing solvent systems and the effect of additives
Kotov, Nikolay ; Dybal, Jiří (advisor) ; Pop-Georgievski, Ognen (referee) ; Šloufová, Ivana (referee)
Title: Cellulose dissolution: Comparison of two non-derivatizing solvent systems and the effect of additives Author: Nikolay Kotov Institute: Institute of Macromolecular Chemistry, Czech Academy of Sciences Supervisor of the doctoral thesis: RNDr. Jiří Dybal, CSc. Consultant: Mgr. Adriana Šturcová, Ph.D. Institute of Macromolecular Chemistry, Czech Academy of Sciences, Department of Vibrational Spectroscopy Abstract: Cellulose is an abundant renewable material, which processing and applicability is limited owing to cellulose inability to dissolve in commonly used solvents. Only specific solvents or their combinations are able to dissolve cellulose and its dissolution processes remain unclear till nowadays. Aim of this thesis was to acquire new experimental information on the changes which cellulose exhibits upon dissolution in two exemplary solvents: an ionic liquid 1-butyl-3-methylimidazolium chloride (bmimCl) and in an organic solvent N,N-dimethylacetamide (DMAc) with lithium chloride (LiCl). The main tool for that investigation is vibrational spectroscopy which provides valuable information about the polymer structure. Similarities and differences found in the spectra of cellulose in those two solvents and influence of cellulose on the solvents are analyzed. Furthermore, influence of additives on the...
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Cellulose dissolution: Comparison of two non-derivatizing solvent systems and the effect of additives
Kotov, Nikolay ; Dybal, Jiří (advisor) ; Pop-Georgievski, Ognen (referee) ; Šloufová, Ivana (referee)
Title: Cellulose dissolution: Comparison of two non-derivatizing solvent systems and the effect of additives Author: Nikolay Kotov Institute: Institute of Macromolecular Chemistry, Czech Academy of Sciences Supervisor of the doctoral thesis: RNDr. Jiří Dybal, CSc. Consultant: Mgr. Adriana Šturcová, Ph.D. Institute of Macromolecular Chemistry, Czech Academy of Sciences, Department of Vibrational Spectroscopy Abstract: Cellulose is an abundant renewable material, which processing and applicability is limited owing to cellulose inability to dissolve in commonly used solvents. Only specific solvents or their combinations are able to dissolve cellulose and its dissolution processes remain unclear till nowadays. Aim of this thesis was to acquire new experimental information on the changes which cellulose exhibits upon dissolution in two exemplary solvents: an ionic liquid 1-butyl-3-methylimidazolium chloride (bmimCl) and in an organic solvent N,N-dimethylacetamide (DMAc) with lithium chloride (LiCl). The main tool for that investigation is vibrational spectroscopy which provides valuable information about the polymer structure. Similarities and differences found in the spectra of cellulose in those two solvents and influence of cellulose on the solvents are analyzed. Furthermore, influence of additives on the...
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19th European Symposium on Polymer Spectroscopy - ESOPS19. 77th Prague Meeting on Macromolecules
Spěváček, Jiří ; Dybal, Jiří
19th European Symposium on Polymer Spectroscopy (ESOPS19) organized simultaneously as the 77th Prague Meeting on Macromolecules (PMM) took place at the Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic in Prague on July 7-11, 2013. Polymer spectroscopy represents important part of the polymer science. Symposium booklet contains conference programme and 96 abstracts of contributions presented by 99 participants from 23 countries during ESOPS19; 9 abstracts of invited lectures, 27 abstracts of oral communications and 60 abstracts of posters. These abstracts cover contributions from all fields of spectroscopy (infrared, NIR, Raman, fluorescence, NMR, EPR, mass spectroscopy, X-ray, dielectric and mechanical spectroscopy). Full texts based on the part of the presented contributions will be published as an issue of the journal Macromolecular Symposia.
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Characterization of valinomycin binding with alkali metal ions by capillary affinity electrophoresis and density functional theory
Ehala, Sille ; Dybal, Jiří ; Makrlík, E. ; Kašička, Václav
Capillary affinity electrophoresis (CAE) and quantum mechanical density functional theory (DFT) have been applied to the study of non-covalent binding of valinomycin (Val), an antibiotic dodecadepsipeptide ionophore, with alkali metal ions, Li+, Na+, K+, Rb+ and Cs+, in methanol. The binding constants (Kb) of Val-alkali metal ion complexes were evaluated by CAE. The most probable structures of the Val-alkali metal ion complexes were proposed by DFT.
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