| Abstract [eng] |
The great need to develop new environmentally friendly materials has led people to focus on natural resources, as non-degradable plastics and their existing natural processing methods have become a threat to the environment and deplete many limited oil resources. Cellulose is the most common biological polymer on earth and is considered an almost inexhaustible source of raw material. Due to the strong intermolecular and molecular interactions resulting from hydrogen bonding and the rigid structure, cellulose is not easily recyclable, does not melt, and does not dissolve in conventional solvents. This master's thesis presents the results of the ionic liquid leaching study from cellulose fiber. The aim of the study was to investigate the parameters influencing the leaching of the ionic liquid remaining during cellulose regeneration. After the analysis of literature sources, cellulose, its structure and production, properties and areas of application were reviewed. Ionic liquids, their characteristics and how they dissolve it in interaction with cellulose have also been studied. The research methodology section describes the research plan, its course, tools used and selected analytical methods. In the part of the research results it was established that the higher volume of water used for washing improves the coagulation of cellulose fiber, as well as the formation of cellulose fiber. Also, repeating the wash more times or increasing the concentration of the ethanol solution resulted in better ionic liquid removal. It is concluded that the chosen ionic liquid, 1-butyl-3-methylimidazole acetate, can be a great alternative to much more expensive and less environmentally friendly ionic liquids. |
