A non-solvent approach for high-stiffness all-cellulose biocomposites based on pure wood cellulose
2010 (English)In: Composites Science And Technology, ISSN 0266-3538, Vol. 70, no 12, 1704-1712 p.Article in journal (Refereed) Published
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 degrees C) on supramolecular cellulose nanostructure is studied by solid state CP/MAS C-13 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.
Place, publisher, year, edition, pages
2010. Vol. 70, no 12, 1704-1712 p.
Wood, Mechanical properties, CP/MAS C-13 NMR, Heat treatment, Isostatic pressing
Chemical Sciences Polymer Technologies
IdentifiersURN: urn:nbn:se:kth:diva-26690DOI: 10.1016/j.compscitech.2010.06.016ISI: 000281998000006ScopusID: 2-s2.0-77955846808OAI: oai:DiVA.org:kth-26690DiVA: diva2:373116
QC 201011302010-11-302010-11-262013-11-11Bibliographically approved