Dissolution of cellulose in ethylene diamine/salt solvent systems |
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Authors: | Margaret W Frey Lei Li Min Xiao Troy Gould |
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Institution: | (1) Department of Textiles and Apparel, Cornell University, College of Human Ecology, 299 MVR Hall, Ithaca, 14853-4401, NY, USA;(2) College of Textiles, North Carolina State University, Raleigh, NC, USA |
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Abstract: | Investigation of the dissolution of cellulose in Ethylene Diamine (EDA)/Potassium thiocyanate (KSCN) solutions by infrared
spectroscopy (FTIR) and thermal analysis (DSC) indicated that changes to the solvent during freeze thaw cycling of mixtures
was consistent with increased interaction between cellulose and solvent. Thermal transitions in the system, however, occurred
at temperatures outside the range used in thermal cycling to promote dissolution. Further exploration of the dissolution and
mixing process indicated that mixing was the limiting step in solution formation. The dissolution of two types of cellulose
with different molecular weights (Degree of Polymerization (DP)=210 and >1000) was studied using EDA/KSCN solution as the
solvent. The solubility and the dissolution rate of cellulose depended on both the solvent composition and cellulose molecular
weight. Cellulose could dissolve faster in the solvent with lower salt concentration but the highest cellulose concentration
was obtained in the solvent with 30~35% KSCN. Rheological measurements showed that cellulose solutions exhibited viscous solution
behavior at low KSCN concentration but primarily elastic behavior at high salt concentration. |
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Keywords: | Cellulose Dissolution Ethylene diamine Mixing Potassium thiocyanate Rheology |
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