121st General Meeting of the KCS

Type Poster Presentation
Area Polymer Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code POLY.P-15
Subject Changes in Properties of Solutions and Hydrogels Depending on Different Concentration Ratios of Cellulose to Tetrabutylammonium Fluoride in Dimethyl Sulfoxide
Authors Deokyeong Choe, Young Min Kim, Keonwook Nam, Byeol I Im, Young Hoon Roh*
Department of Biotechnology, Yonsei University, Korea
Abstract Cellulose is the most abundant biopolymer on the earth. It is renewable, biodegradable, environmentally friendly, and cheap. Especially, cellulose is suitable to develop hard hydrogel since it is an organic polymer with high strength, high stiffness, and low density. In spite of these advantages, diverse use of the cellulose is limited as it does not dissolve in water and most of the commonly used organic solvents. Therefore, the cellulose dissolution using tetrabutylammonium fluoride (TBAF) and dimethyl sulfoxide (DMSO) has attracted researchers. Studies about changes in properties of the cellulose solutions and hydrogels depending on different concentration ratios of cellulose and TBAF in DMSO will provide useful information. In this study, the viscosities of cellulose solutions at different TBAF concentrations were examined. The cellulose solution viscosity was the highest among all samples at a specific ratio of cellulose and TBAF. The size of cellulose particles in the solutions was measured by dynamic light scattering to verify the reasons for such phenomenon. As a result, the cellulose particle size was the smallest at the highest viscosity concentration. Furthermore, cellulose hydrogels prepared from the solutions with smaller particles were more transparent than that of the solutions with bigger particles. Cellulose hydrogel crystallinity and morphology were characterized and compared to investigate the physicochemical properties of the cellulose hydrogels. Regardless of the TBAF concentration, the cellulose hydrogels were mostly formed in an amorphous state. On the other hand, the surface of the hydrogels became more rugged when the TBAF concentration increased. These results are expected to help open up broad possibilities for applications of cellulose.
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