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Mechanical properties of bacterially synthesized nanocellulose hydrogels

 
: Frensemeier, M.; Koplin, C.; Jaeger, R.; Kramer, F.; Klemm, D.

:
Preprint urn:nbn:de:0011-n-1725994 (92 KByte PDF)
MD5 Fingerprint: 3bc1282a451396a7c629d6962854ac73
Erstellt am: 20.10.2012


Heinze, T.:
Utilization of lignocellulosic materials : Selected contributions from the conference: 51st Cellulose Symposium in: Wiesbaden (Germany), June 23 to 24, 2009
Weinheim: Wiley-VCH, 2010 (Macromolecular symposia 294.2010, Nr.2)
ISSN: 0258-0322
S.38-44
Cellulose Symposium <51, 2009, Wiesbaden>
Englisch
Konferenzbeitrag, Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()

Abstract
The mechanical characteristics of bacterially synthesized nano-cellulose (BNC) were studied with uniaxial compression and tensile tests. Compressive loads result in a release of water and the deformation of the water-saturated network corresponds approximately to the volume of released water. The BNC hydrogel exhibits a mainly viscous response under compression. The strain response under tensile loads has an elastic and a viscous component. This can be described with a Maxwell model, where the viscosity is strain rate-dependent. When the aqueous phase of the BNC hydrogel is stabilized with an additional alginate hydrogel matrix, the system exhibits an elastic response under compressive loads. The analysis of the 'alginated' BNC network with the Maxwell model shows that the alginate matrix increases the viscosity of the composite system. The results of the mechanical tests show that the water absorbed in the BNC hydrogel strongly influences its mechanical behavior.

: http://publica.fraunhofer.de/dokumente/N-172599.html