title: Effect of compression combined with steam treatment on the porosity, chemical compositon and cellulose crystalline structure of wood cell walls.
abstract: The changes of porosity, chemical composition and cellulose crystalline structure of Spruce (Picea abies Karst.) wood cell walls due to compression combined with steam treatment (CS-treatment) were investigated by nitrogen adsorption, confocal Raman microscopy (CRM) and X-ray diffraction (XRD), respectively. A number of slit-shaped mesopores with a diameter of 3.7nm was formed for the CS-treated wood, and more mesopores were found in the steam-treated wood. CRM results revealed cellulose structure was affected by treatment and β-aryl-ether links associated to guaiacyl units of lignin was depolymerized followed by re-condensation reactions. The crystallinity index (CrI) and crystallite thickness (D200) of cellulose for CS-treated wood were largely increased due to crystallization in the semicrystalline region. Higher degree of increase in both CrI and D200was observed in both the earlywood and latewood of steam-treated wood, ascribing to the greater amount of mesopores in steam-treated wood than CS-treated wood.
authors.affiliation: Department of Wood Anatomy and Utilization, Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
authors.forename: Jiangping
authors.initials: J
authors.lastname: Yin
authors.affiliation: Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
authors.forename: Tongqi
authors.initials: T
authors.lastname: Yuan
authors.affiliation: Department of Wood Anatomy and Utilization, Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Lu
authors.affiliation: School of Renewable Natural Resources, Louisiana State University, Baton Rouge, LA 70803, USA.
authors.forename: Kunlin
authors.initials: K
authors.lastname: Song
authors.affiliation: College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
authors.forename: Hanyin
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
authors.forename: Guangjie
authors.initials: G
authors.lastname: Zhao
authors.affiliation: Department of Wood Anatomy and Utilization, Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China. Electronic address: yafang@caf.ac.cn.
authors.forename: Yafang
authors.initials: Y
authors.lastname: Yin
keywords: Cellulose; Cellulose crystalline structure; Compression combined with steam treatment; Lignin; Mesopores