Mode of wood fibre breakage during thermoplastic melt processing
| Autor: | David Sandquist, Alan R. Dickson |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Thermoplastic Glass fiber 02 engineering and technology A. Wood fibres engineering.material E. Extrusion Breakage Injection moulding Composite material Wood fibre D. Optical microscopy 040101 forestry chemistry.chemical_classification ta214 Pulp (paper) 04 agricultural and veterinary sciences Polymer 021001 nanoscience & nanotechnology chemistry Mechanics of Materials Ceramics and Composites engineering 0401 agriculture forestry and fisheries Extrusion 0210 nano-technology B. Fibre deformation |
| Zdroj: | Dickson, A R & Sandquist, D 2018, ' Mode of wood fibre breakage during thermoplastic melt processing ', Composites Part A: Applied Science and Manufacturing, vol. 112, pp. 496-503 . https://doi.org/10.1016/j.compositesa.2018.07.004 |
| ISSN: | 1878-5840 1359-835X |
| Popis: | During polymer composite melt processing thermomechanical wood pulp fibres (WF) have a different breakage mode than described for other natural fibres and glass fibre. During repeated bending, expected during twin-screw extrusion and injection moulding, WF fail by a mode related to their cross-section dimensions. Generally, fibres with large lumens relative to wall thickness ovalise and buckle. Conversely fibres with small lumens relative to wall thickness generally fracture. Confocal microscopy of WF extracted from the polymer matrix after melt processing showed a high degree of cross-section collapse of the bent and twisted fibres. The ability to cross-sectionally collapse during composites processing may make the fibres more resilient to repeated bending stresses and help with fibre length retention. Observations suggest fractures were initiated from the edges of the bent fibres and propagated across the fibre. |
| Databáze: | OpenAIRE |
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