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Hydrogel state impregnation of cellulose fibre-phenol composites: effects of fibre size distribution
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0002-2388-3358
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0003-4762-2854
2016 (Engelska)Ingår i: ECCM 2016: Proceeding of the 17th European Conference on Composite Materials, European Conference on Composite Materials , 2016Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Whilst it has been well established that cellulose nanofibres (CNF) networks produce films that have high stiffness and strength, they are difficult to impregnate. Investigated in this study is whether by controlling the degree of nanofibrillation of cellulose, composites based on micro- and nano-size cellulose fibres can be made that are more easily manufactured and have better impregnation than solely cellulose nano-fibre based composites. To evaluate this, cellulose at different stages of ultrafine grinding, extracted at time intervals of 30, 60 and 290 mins, were used to make composites. To achieve good impregnation a novel strategy was used based on impregnation with phenol resin whilst the fibrillated cellulose is in a hydrogel state. The composites were subsequently dried and consolidated by hot press. The current results show that this method of impregnation is successful and the phenol matrix greatly improves the properties of the cellulose with a low degree of fibrillation. In general, as the degree of fibrillation and the proportion of nanofibres increases, the mechanical properties of the networks and their composites increase. The addition of the matrix appears to restrict the deformation of CNF network, increasing the modulus and yield strength but decreasing the ultimate strength. The method also appears to restrict the consolidation and voids remain in the composite, which reduces the modulus when compared to theoretical maximum values for this material. More work on the consolidation process is necessary to achieve the full potential of these composites.

Ort, förlag, år, upplaga, sidor
European Conference on Composite Materials , 2016.
Nyckelord [en]
nanofibres, impregnation, phenol, network behaviour, fibrillation, Materials science - Other processing/assembly
Nyckelord [sv]
Teknisk materialvetenskap - Övrig bearbetning/sammanfogning
Nationell ämneskategori
Biomaterial
Forskningsämne
Trä och bionanokompositer; Smarta maskiner och material (FOI)
Identifikatorer
URN: urn:nbn:se:ltu:diva-29908Scopus ID: 2-s2.0-85017671151Lokalt ID: 388103c5-2224-45e5-8e38-95a1df306d90ISBN: 978-3-00-053387-7 (tryckt)OAI: oai:DiVA.org:ltu-29908DiVA, id: diva2:1003135
Konferens
17th European conference on composite materials, ECCM-17, Munich, Germany, 26-30 June 2016
Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-11-25Bibliografiskt granskad

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Aitomäki, YvonneOksman, Kristiina
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