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Vacuum Infusion of Nanocellulose Networks of Different Porosity
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2015 (English)In: 20th International Conference on Composite Materials: Copenhagen, 19-24th July 2015, ICCM , 2015, 4109-1Conference paper (Refereed)
Abstract [en]

Cellulose nanofibres (CNF) have shown good potential as sustainable, biobased reinforcing materials in polymer composites. Addressing issues around the processing of these composites is an important part of establishing their use in different applications. Here, CNF networks of different porosity are made from nanofibrillated hardwood kraft pulp with the aim of increasing the impregnation of the CNF networks and to allow vacuum infusion to be used. Two different vacuum infusion strategies: in-plane and out of plane were used to infuse the CNF networks with a low viscosity epoxy. The permeability, morphology and mechanical properties of the dry networks and the resulting nanocomposites were investigated and compared to a micro-fibre based network. Using the out-of-plane permeability measurements and Darcy’s law, the fill-time was calculated and showed that the CNF network with 40% porosity had the lowest fill-time when an out-of-plane impregnation strategy is used. However this exceeded the gel-time of the epoxy system. In experiments, the resin reached the other side of the network but low transparency indicated that wetting was poor. The dry CNF preforms showed a very strong dependence on the porosity with both modulus and strength increasing rapidly at low porosity. Interestingly, the composite based on the 60% porosity network showed good wetting particularly with the in-plane infusion strategy, exhibiting a much more brittle fracture and a high yield strength. This shows that in CNF composites produced by VI, lowering the fibre volume content of the CNF composites gives better impregnation resulting in a lower ultimate strength but higher yield strength and no loss in modulus.

Place, publisher, year, edition, pages
ICCM , 2015. 4109-1
Keyword [en]
cellulose fi, permeability, vacuum infusion, Materials science - Other material science
Keyword [sv]
Teknisk materialvetenskap - Övrig teknisk materialvetenskap
Research subject
Wood and Bionanocomposites; Fluid Mechanics
URN: urn:nbn:se:ltu:diva-27554Local ID: 10d082e9-a540-44c0-922a-85453788cc6cOAI: diva2:1000738
International Conference on Composite Materials : 19/07/2015 - 24/07/2015
Godkänd; 2015; 20151218 (aitomaki)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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Aitomäki, YvonneMoreno, SergioLundström, StaffanOksman, Kristiina
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