Abstract
The supramolecular structure of eucalyptus pulp cellulose was studied by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and water retention value (WRV) after subjecting the pulp to pressures of 0.1, 0.2, 0.3, 0.4 and 0.5 MPa. It was interpreted from the FTIR spectra of the sheets after pressing that the amount of intermolecular hydrogen bonds (HBinter) first increased and then decreased as a function of increasing pressure, while the number of the intramolecular hydrogen bonding (HBintra) exhibited an opposite trend. In the pressed fibers, the number of HBintra O(6)H· · ·O(3′) increased by 16% compared to the un-pressed fibers, while the number of HBinter O(2)H· · ·O(6) and O(3)H· · ·O(5) decreased by 23% at 0.3 MPa. XRD analysis showed that the crystallite size corresponding to the diffraction peaks for (002) lattice planes and the crystallinity of eucalyptus fibers were the lowest at a pressure of 0.3 MPa. Pressing produced an irreversible reduction of fiber pore volume, which was manifested by reduced WRV data.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work was supported by the National Natural Science Foundation of China (No. 21606092), the Pearl River S and T Nova Program of Guangzhou (201710010109), China, the Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, the Ministry of Education, South China University of Technology, China, the Presidential Foundation of the College of Natural Resources and Environment, South China Agricultural University, China (No. ZHXY2015A04), and the Science and Technology Planning Project of Guangdong Province, China (20170405, 2014A020216033).
Employment or leadership: None declared.
Honorarium: None declared.
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©2018 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Articles
- Increasing pulp yield in kraft cooking of softwoods by high initial effective alkali concentration (HIEAC) during impregnation leading to decreasing secondary peeling of cellulose
- Effects of wet-pressing induced fiber hornification on hydrogen bonds of cellulose and on properties of eucalyptus paper sheets
- Antisolvent precipitation of hemicelluloses, lignosulfonates and their complexes from ultrafiltrated spent sulfite liquor (SSL)
- Simultaneous pyrolysis and trimethylsilylation with N-methyl-(trimethylsilyl) trifluoroacetamide for the characterisation of lignocellulosic materials from kraft pulping
- Hygro-mechanical analysis of wood subjected to constant mechanical load and varying relative humidity
- In-situ density estimation by four nondestructive techniques on Norway spruce from built-in wood structures
- Formability of wood veneers: a parametric approach for understanding some manufacturing issues
- Influence of grain direction on the time-dependent behavior of wood analyzed by a 3D rheological model. A mathematical consideration
- Isolation of secondary metabolites from Stenochlaena palustris stems and structure-activity relationships of 20-hydroxyecdysone derivatives on antitermite activity
- Effects of white rot and brown rot decay on the drilling resistance measurements in wood
Articles in the same Issue
- Frontmatter
- Original Articles
- Increasing pulp yield in kraft cooking of softwoods by high initial effective alkali concentration (HIEAC) during impregnation leading to decreasing secondary peeling of cellulose
- Effects of wet-pressing induced fiber hornification on hydrogen bonds of cellulose and on properties of eucalyptus paper sheets
- Antisolvent precipitation of hemicelluloses, lignosulfonates and their complexes from ultrafiltrated spent sulfite liquor (SSL)
- Simultaneous pyrolysis and trimethylsilylation with N-methyl-(trimethylsilyl) trifluoroacetamide for the characterisation of lignocellulosic materials from kraft pulping
- Hygro-mechanical analysis of wood subjected to constant mechanical load and varying relative humidity
- In-situ density estimation by four nondestructive techniques on Norway spruce from built-in wood structures
- Formability of wood veneers: a parametric approach for understanding some manufacturing issues
- Influence of grain direction on the time-dependent behavior of wood analyzed by a 3D rheological model. A mathematical consideration
- Isolation of secondary metabolites from Stenochlaena palustris stems and structure-activity relationships of 20-hydroxyecdysone derivatives on antitermite activity
- Effects of white rot and brown rot decay on the drilling resistance measurements in wood