NDLI: Mechanical and structural properties of native and alkali-treated bacterial cellulose produced by Gluconacetobacter xylinus strain ATCC 53524

Content Provider	Springer Nature Link
Author	McKenna, Brigid A. Mikkelsen, Deirdre Wehr, J. Bernhard Gidley, Michael J. Menzies, Neal W.
Copyright Year	2009
Abstract	Mechanical properties of hydrated bacterial cellulose have been tested as a function of fermentation time and following the alkali treatment required for sterilisation prior to biomedical applications. Bacterial cellulose behaves as a viscoelastic material, with brittle failure reached at approximately 20% strain and 1.5 MPa stress under uniaxial tension. Treatment with 0.1 M NaOH resulted in minimal effects on the mechanical properties of bacterial cellulose. Fermentation time had a large effect on both bacterial numbers and cellulose yield but only minor effects on mechanical properties, showing that the fermentation system is a robust method for producing cellulose with predictable materials properties. The failure zone in uniaxial tension was shown to be associated with large-scale fibre alignment, consistent with this being the major determinant of mechanical properties. Under uniaxial tension, elastic moduli and failure stresses are an order of magnitude lower than those obtained under biaxial tension, consistent with the fibre alignment mechanism which is not available under biaxial tension.
Starting Page	1047
Ending Page	1055
Page Count	9
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	16
Issue Number	6
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-07-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cellulose Gluconacetobacter xylinus Mechanical properties Scanning electron microscopy Tensile testing Polymer Sciences Organic Chemistry Physical Chemistry Bioorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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