A non-solvent approach for high-stiffness all-cellulose biocomposites based on pure wood cellulose |
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| Authors: | Helena Nilsson Sylvain Galland Per Tomas Larsson E. Kristofer Gamstedt Takashi Nishino Lars A. Berglund Tommy Iversen |
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| Affiliation: | 1. Wallenberg Wood Science Center, Royal Inst. of Technology, SE-100 44 Stockholm, Sweden;2. INNVENTIA AB, PO Box 5604, SE-114 86 Stockholm, Sweden;3. Dept. of Fiber and Polymer Techn., Royal Inst. of Technology, SE-100 44 Stockholm, Sweden;4. Dept. of Chem. Sci. and Engng., Kobe Univ., Rokko, Nada, Kobe 657-8501, Japan |
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| Abstract: | All-cellulose composites are commonly prepared using cellulose solvents. In this study, moldable all-cellulose I wood fiber materials of high cellulose purity (97%) were successfully compression molded. Water is the only processing aid. The material is interesting as a “green” biocomposite for industrial applications. Dissolving wood fiber pulps (Eucalyptus hardwood and conifer softwood) are used and the influence of pulp origin, beating and pressing temperature (20–180 °C) on supramolecular cellulose nanostructure is studied by solid state CP/MAS 13C NMR. Average molar mass is determined by SEC to assess process degradation effects. Mechanical properties are determined in tensile tests. High-density composites were obtained with a Young’s modulus of up to 13 GPa. In addition, nanoscale cellulose fibril aggregation was confirmed due to processing, and resulted in a less moisture sensitive material. |
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| Keywords: | A. Wood B. Mechanical properties C. CP/MAS 13C NMR E. Heat treatment E. Isostatic pressing |
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