title: Susceptibility of Iα- and Iβ-Dominated Cellulose to TEMPO-Mediated Oxidation.
abstract: The susceptibility of Iα- and Iβ-dominated cellulose to TEMPO-mediated oxidation was studied in this work since the cellulose Iα-allomorph is generally considered to be thermodynamically less stable and therefore more reactive than the cellulose Iβ-allomorph. Highly crystalline Cladophora nanocellulose, which is dominated by the Iα-allomorph, was oxidized to various degrees with TEMPO oxidant via bulk electrolysis in the absence of co-oxidants. Further, the Cladophora nanocellulose was thermally annealed in glycerol to produce its Iβ-dominated form and then oxidized. The produced materials were subsequently studied using FTIR, CP/MAS (13)C NMR, XRD, and SEM. The solid-state analyses confirmed that the annealed Cladophora cellulose was successfully transformed from an Iα- to an Iβ-dominated form. The results of the analyses of pristine and annealed TEMPO-oxidized samples suggest that Iα- and Iβ-dominated cellulose do not differ in susceptibility to TEMPO-oxidation. This work hence suggests that cellulose from different sources are not expected to differ in susceptibility to the oxidation due to differences in allomorph composition.
authors.affiliation: Nanotechnology and Functional Materials, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden.
authors.forename: Daniel O
authors.initials: DO
authors.lastname: Carlsson
authors.affiliation: Nanotechnology and Functional Materials, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden.
authors.forename: Jonas
authors.initials: J
authors.lastname: Lindh
authors.affiliation: Nanotechnology and Functional Materials, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden.
authors.forename: Maria
authors.initials: M
authors.lastname: Strømme
authors.affiliation: Nanotechnology and Functional Materials, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden.
authors.forename: Albert
authors.initials: A
authors.lastname: Mihranyan
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry* / Q000378:metabolism; D003460:Crystallization; D003497:Cyclic N-Oxides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D003497:Cyclic N-Oxides; D002482:Cellulose; C003959:TEMPO