Journal
CELLULOSE
Volume 16, Issue 6, Pages 1047-1055Publisher
SPRINGER
DOI: 10.1007/s10570-009-9340-y
Keywords
Cellulose; Gluconacetobacter xylinus; Mechanical properties; Scanning electron microscopy; Tensile testing
Funding
- Australian Research Council [DP0665467, DP058067]
- Australian Research Council [DP0665467] Funding Source: Australian Research Council
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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.
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