We describe the wet and dry-wet spinning of multifilament cellulosic composite fibers, namely chitin/cellulose fibers. The direct solution process for the two biopolymers based on an ionic liquid as solvent represents an environmentally friendly and alternative technology to the industrially applied viscose and lyocell process. Both cellulose and chitin possess good solubility in 1-ethyl-3-methylimidazolium propionate ([C 2 C 1 Im][OPr]) and were spun into multifilament composite fibers. Moreover, for the first time, pure chitin multifilament fibers were obtained by dry-wet spinning. The effect of chitin addition on the filament properties was investigated and evaluated by microscopic, spectroscopic, and mechanical analyses.
Poly(ethyleneimine) (PEI) immobilized on support materials are valuable alternatives to aqueous amine solutions for carbon dioxide (CO 2 ) capture from the atmosphere since the thermal desorption of CO 2 from these materials usually requires less energy. Herein, fibrous PEI-functionalized carrier systems based on cellulose, cellulose tosylate (CT), and cellulose carbamate (CC) are described. Branched PEI is used for functionalization since higher CO 2 sorption capacities compared to linear PEIs can be achieved. Under wet conditions, a PEI-functionalized nonwoven material has a sorption capacity of 0.026 mg CO 2 /mg adsorbent; complete and reversible CO 2 desorption is accomplished at 80 °C.
IntroductionCarbon dioxide (CO 2 ) is a climate-damaging exhaust gas. It can, however, also be used as a resource for plastics or renewable fuels, and thus potentially replace fossil natural gas and crude oil. Adsorption of CO 2 from air is currently under consideration for combating climate change in several respects: it can reduce the amount of the greenhouse gas in the atmosphere, make it usable for the chemical industry and thus enable a reduction in future emissions. Therefore, it is necessary to identify methods for reducing and using the CO 2 being produced and emitted into the
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