Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 496-503 |
| Number of pages | 8 |
| Journal | Composites Part A: Applied Science and Manufacturing |
| Volume | 112 |
| DOIs | |
| Publication status | Published - 1 Sep 2018 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- A. Wood fibres
- B. Fibre deformation
- D. Optical microscopy
- E. Extrusion
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Mode of wood fibre breakage during thermoplastic melt processing. / Dickson, Alan R. (Corresponding Author); Sandquist, David (Corresponding Author).
In: Composites Part A: Applied Science and Manufacturing, Vol. 112, 01.09.2018, p. 496-503.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Mode of wood fibre breakage during thermoplastic melt processing
AU - Dickson, Alan R.
AU - Sandquist, David
PY - 2018/9/1
Y1 - 2018/9/1
N2 - 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.
AB - 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.
KW - A. Wood fibres
KW - B. Fibre deformation
KW - D. Optical microscopy
KW - E. Extrusion
UR - http://www.scopus.com/inward/record.url?scp=85049435161&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2018.07.004
DO - 10.1016/j.compositesa.2018.07.004
M3 - Article
VL - 112
SP - 496
EP - 503
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
SN - 1359-835X
ER -