title: Corncob arabinoxylan for new materials.
abstract: Corncob agricultural waste was used as a source of arabinoxylan for preparation of films. Three arabinoxylan samples were prepared: crude extract (CCAX), purified by a washing step, and purified by bleaching CCAX. Films prepared with untreated CCAX were water soluble, yellowish in color and had poor mechanical properties. After the purification processes the Young's modulus increased from ∼ 293 MPa to ∼ 1400-1600 MPa, and strength was improved from ∼ 9 MPa to around 53 MPa, while the strain at break was kept at ∼ 8% both in untreated and purified CCAX. The contact angle was increased from ∼ 21.3° to 67-74° after washing or bleaching CCAX. Acetylation of bleached CCAX showed the highest thermal resistance (325 °C), had low Tg (125°C) and a high contact angle (80°), and its films were stronger (strength ∼ 67 MPa; Young's modulus ∼ 2241 MPa) and more flexible (∼ 13%). These characteristics make purified CCAX a suitable material to be used as a matrix for film applications.
authors: Chemical and Environmental Engineering Department, University of the Basque Country, Plaza Europa, 1, 20018 Donostia-San Sebastián, Spain. Electronic address: itziar.egues@ehu.es.
authors: Itziar
authors: I
authors: Egüés
authors: Department of Chemical and Biological Engineering, Biopolymer Technology, Chalmers University of Technology, SE-412 96 Göteborg, Sweden; Wallenberg Wood Science Center, Göteborg, Sweden. Electronic address: agnes.stepan@chalmers.se.
authors: Agnes M
authors: AM
authors: Stepan
authors: Chemical and Environmental Engineering Department, University of the Basque Country, Plaza Europa, 1, 20018 Donostia-San Sebastián, Spain. Electronic address: arantxa.eceiza@ehu.es.
authors: Arantxa
authors: A
authors: Eceiza
authors: Department of Wood, Cellulose and Paper Research, University of Guadalajara, Guadalajara, Mexico; Wallenberg Wood Science Center, Göteborg, Sweden. Electronic address: guillert@chalmers.se.
authors: Guillermo
authors: G
authors: Toriz
authors: Department of Chemical and Biological Engineering, Biopolymer Technology, Chalmers University of Technology, SE-412 96 Göteborg, Sweden; Wallenberg Wood Science Center, Göteborg, Sweden. Electronic address: paul.gatenholm@chalmers.se.
authors: Paul
authors: P
authors: Gatenholm
authors: Chemical and Environmental Engineering Department, University of the Basque Country, Plaza Europa, 1, 20018 Donostia-San Sebastián, Spain. Electronic address: jalel.labidi@ehu.es.
authors: Jalel
authors: J
authors: Labidi
keywords: Acetylation; Arabinoxylan; Corncob; Films; Purification