title: TEMPO-mediated oxidation of oat β-D-glucan and its influences on paper properties.
abstract: An enhanced bonding agent for papermaking was prepared by selective oxidation of a hemicellulose-rich byproduct of oat processing, which will be identified here by its primary component, β-D-glucan. The β-D-glucan was treated sequentially with (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) and sodium hypochlorite, or alternatively just with sodium hydroxide. When added to a slurry of unbleached softwood kraft fibers, in combination with an optimal dosage of aluminum sulfate, the oxidized β-D-glucan yielded greater increases in tensile strength and folding endurance in comparison to untreated β-D-glucan. NaOH treatment also improved dry-strength performance of the β-D-glucan, except for folding endurance. The improvements were attributed to increased charge density of the treated polyelectrolytes, leading to better distribution and retention on fibers prior to sheet formation. Modified β-D-glucan also enhanced the strength of recycled sheets when the treated paper was repulped and formed into recycled paper with no further chemical addition.
authors.affiliation: College of Material Science and Technology, Beijing Forestry University, Beijing 100083, China; Department of Forest Biomaterials, North Carolina State University, Campus Box 8005, Raleigh, NC 27695-8005, USA.
authors.forename: Xianliang
authors.initials: X
authors.lastname: Song
authors.forename: Martin A
authors.initials: MA
authors.lastname: Hubbe
mesh_terms: D000534:Alum Compounds / Q000737:chemistry; D018554:Avena / Q000737:chemistry*; D003497:Cyclic N-Oxides / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D010209:Paper; D011134:Polysaccharides / Q000737:chemistry*; D011509:Proteoglycans; D012972:Sodium Hydroxide / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D047071:beta-Glucans / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000534:Alum Compounds; D003497:Cyclic N-Oxides; D011134:Polysaccharides; D011509:Proteoglycans; D047071:beta-Glucans; C041524:aluminum sulfate; C010770:polysaccharide-K; D012972:Sodium Hydroxide; C007916:hemicellulose; D012973:Sodium Hypochlorite; C003959:TEMPO
keywords: Dry strength; NaOH treatment; Paper properties; TEMPO-mediated oxidation; β-d-Glucan