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Determination of Youngs Modulus for Nanofibrillated Cellulose Multilayer Thin Films Using Buckling Mechanics
Royal Institute of Technology.
Royal Institute of Technology.
Royal Institute of Technology.
Bruker AXS Nord AB.
Vise andre og tillknytning
2011 (engelsk)Inngår i: BIOMACROMOLECULES, ISSN 1525-7797, Vol. 12, nr 4, s. 961-969Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The Youngs modulus of multilayer films containing nanofibrillated cellulose (NFC) and polyethyleneimine (PEI) was determined Using the strain-induced elastic buckling instability for mechanical measurements (SLEBIMM) technique.(1) Multilayer films were built up on polydimethylsiloxane substrates using electrostatic layer-by-layer assembly. At 50% relative humidity, SIEBIMM gave a constant Youngs modulus of 1.5 +/- 0.2 GPa for 35-75 run thick films. Conversely, in vacuum, the Youngs modulus was 10 times larger, at 17.2 +/- 1.2 GPa. A slight decrease in buckling wavelength with increasing strain was observed by scanning electron microscopy with in situ compression, and above 10% strain, extensive cracking parallel to the compressive direction occurred. We conclude that whereas PEI acts as a "glue" to hold multiple layers of NFC together, it prevents full development of hydrogen bonding and specific fibril-fibril interactions, and at high humidity, its hygroscopic nature decreases the elastic modulus when compared with pure NFC films.

sted, utgiver, år, opplag, sider
American Chemical Society , 2011. Vol. 12, nr 4, s. 961-969
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Identifikatorer
URN: urn:nbn:se:liu:diva-67842DOI: 10.1021/bm101330wISI: 000289223500013OAI: oai:DiVA.org:liu-67842DiVA, id: diva2:413584
Tilgjengelig fra: 2011-04-29 Laget: 2011-04-29 Sist oppdatert: 2013-10-14

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