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Nanocellulose Based Films: Improved Mechanical And Gas Barrier Properties
KTH, School of Information and Communication Technology (ICT).
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Microfibrillated cellulose (MFC) films have been prepared to demonstrate the potential of the material in order to see if it is a possibility to replace most parts of petroleum-based plastics. MFC is produced by mechanically delaminating the wood fiber cell wall into individual nano-fibrils. There are different ways to fabricate MFC at low energy consumption, thus keeping the cost down. The MFC films were produced using two different techniques; solvent-casting and by vacuum filtering, nanofiltration. The MFC films were characterized in terms of optical, mechanical and gas barrier properties. The results show that MFC (Generation 2) has superior mechanical properties and very promising oxygen barrier properties. MFC (Generation 2) has a more dense and homogenous nanocellulose film structure, thus very good oxygen permeability properties. These properties are good indications that MFC films have many suitable positive properties for use in e.g. the packaging industry. Incorporations of different components, such as nanoclays, latex or ionic crossed-linked improves the gas barrier properties for the MFC films.

Abstract [sv]

Detta examensarbete handlar om filmer tillverkade av mikrofibrilär cellulosa (MFC). Syftet med studien var att se om det går att ersätta dagens petroleumbaserade plaster med MFC-filmer. Olika typer av MFC undersöktes, och detta gjordes genom olika tester av de mekaniska och optiska egenskaperna, samt en undersökning för att se permeabiliteten för syre genom MFC-filmer. MFC framställs genom att man mekaniskt bearbetar träfibrer och delaminerar på fibrillaggregaten som cellväggarna är delvis uppbyggda av. Det finns flera olika sätt att framställa MFC och hålla nere energikonsumtionen och därmed kostnaderna. Filmerna framställdes genom två olika sätt, det ena enklare genom att låta vattnet avdunsta i ett konditionerat rum, och den andra genom att vakuumfiltrera. Resultaten visar att typen, även kallad Generation 2, har bäst mekaniska egenskaper jämfört med alla andra generationer, samtidigt som den har bäst förmåga att motstå syrepermeabilitet. Generation 2 har en mer homogen filmstruktur, därav klarar den av att motstå permeabiliteten för syre. Behandlingen av olika preparat, så som nanoleror, latex och jonbyten kommer påverka egenskaperna för MFC filmerna.

Place, publisher, year, edition, pages
2012. , 58 p.
Series
Trita-ICT-EX, 2012:137
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-107869OAI: oai:DiVA.org:kth-107869DiVA: diva2:578294
Educational program
Master of Science in Engineering - Microelectronics
Uppsok
Technology
Examiners
Available from: 2012-12-18 Created: 2012-12-18 Last updated: 2012-12-18Bibliographically approved

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