Study of cellulose/ethylene diamine/salt systems |
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Authors: | Min Xiao Margaret W Frey |
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Institution: | (1) Department of Fiber Science and Apparel Design, College of Human Ecology, Cornell University, 299 MVR Hall, Ithaca, NY 14853, USA |
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Abstract: | To better understand the complex interactions leading to dissolution of cellulose in ethylene diamine (EDA)/salt solvents,
studies of interactions in sub systems of solution components and a model system based on cellobiose were conducted. Interaction
between EDA and salt cation was investigated through comparison of solvation of K+, Na+ and Li+ in the EDA/H2O binary solvent system. The least degree of solvation of K+ in EDA increased its availability for direct interaction with cellulose. Wide angle X-ray diffraction was utilized to study
the interaction between EDA and cellulose. The effect of various solvents on cellulose crystalline polymorph was compared.
The results indicated that cellulose was easily accessible to EDA and 1,3-diaminopropane, but was not affected by water or
ethanolamine. The effect of salt concentration was investigated using cellobiose as a model compound through HSQC (Heteronuclear
Single Quantum Coherence) NMR spectroscopy. Solid state CP/MAS (cross polarization/magic angle spinning) 13C NMR spectroscopy was employed to characterize changes in the conformation of the CH2OH group of cellulose during dissolution. A mechanism scheme of cellulose dissolution in EDA/KSCN systems was proposed based
on the information gathered. |
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Keywords: | Cellulose dissolution Interaction NMR Conformation Mechanism scheme |
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