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Vacuum infusion of cellulose nanofibre network composites: Influence of porosity on permeability and impregnation
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-2388-3358
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.ORCID iD: 0000-0002-1033-0244
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4762-2854
2016 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 95, p. 204-211Article in journal (Refereed) Published
Abstract [en]

Addressing issues around the processing of cellulose nanofibres (CNF) composites is important in establishing their use as sustainable, renewable polymer reinforcements. Here, CNF networks of different porosity were made with the aim of increasing their permeability and suitability for processing by vacuum infusion (VI). The CNF networks were infused with epoxy using two different strategies. The permeability, morphology and mechanical properties of the dry networks and the resulting nanocomposites were investigated. Calculated fill-times for CNF networks with 50% porosity were the shortest, but are only less than the gel-time of the epoxy if capillary effects are included. In experiments the CNF networks were clearly wetted. However low transparency indicated that impregnation was incomplete. The modulus and strength of the dry CNF networks increased rapidly with decreasing porosity, but their nanocomposites did not follow this trend, showing instead similar mechanical properties to each other. The results demonstrated that increasing the porosity of the CNF networks to ≈ 50% gives better impregnation resulting in a lower ultimate strength, a higher yield strength and no loss in modulus. Better use of the flow channels in the inherently layered CNF networks could potentially reduce void content in these nanocomposites and thus increase their mechanical properties.

Place, publisher, year, edition, pages
2016. Vol. 95, p. 204-211
National Category
Bio Materials Fluid Mechanics and Acoustics
Research subject
Wood and Bionanocomposites; Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-13549DOI: 10.1016/j.matdes.2016.01.060ISI: 000371295200024Scopus ID: 2-s2.0-84960122004Local ID: cc68137c-8617-4716-8af7-f2f22f7bf320OAI: oai:DiVA.org:ltu-13549DiVA, id: diva2:986502
Note

Validerad; 2016; Nivå 2; 20160121 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Aitomäki, YvonneMoreno, SergioLundström, StaffanOksman, Kristiina

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