Abstract
This study presents a rapid method for nanopaper production by spray deposition of high concentration microfibrillated cellulose (MFC) slurries on a nylon fabric and their subsequent filtration dewatering. The filtration time for the consolidation of a wet MFC mat was of 15 and 90s for sheets with basis weight of 13.7 and 124gm−2, respectively. MFC films exhibited excellent Young's modulus of ca. 18GPa and intrinsic air permeability of ca. 0.22nm2. Nevertheless, the progressive decrease of the basis weight from 124 to 13.7gm−2 induced the decay of the film tensile properties (stress and strain at break dropped from 150MPa and 4.6% to 50MPa and 0.4%) and the onset of a brittle behaviour. This trend was ascribed to the presence of residual fibre debris in the MFC slurry which acted as fracture nucleation spots in thin films.
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