Mode of wood fibre breakage during thermoplastic melt processing

Alan R. Dickson; David Sandquist

doi:10.1016/j.compositesa.2018.07.004

Mode of wood fibre breakage during thermoplastic melt processing

Alan R. Dickson (Corresponding Author), David Sandquist (Corresponding Author)

BA3502 Biocomposites and processing

Research output: Contribution to journal › Article › Scientific › peer-review

7 Citations (Scopus)

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	https://doi.org/10.1016/j.compositesa.2018.07.004
Publication status	Published - 1 Sep 2018
MoE publication type	A1 Journal article-refereed

Keywords

A. Wood fibres
B. Fibre deformation
D. Optical microscopy
E. Extrusion

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title = "Mode of wood fibre breakage during thermoplastic melt processing",

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.",

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AU - Dickson, Alan R.

AU - Sandquist, David

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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

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