Abstract
Films of bacterial cellulose (BC) reinforced by natural rubber (NR) with remarkably high mechanical strength were developed by combining the prominent mechanical properties of multilayer BC nanofibrous structural networks and the high elastic hydrocarbon polymer of NR. BC pellicle was immersed in a diluted NR latex (NRL) suspension in the presence of ethanol aqueous solution. Effects of NRL concentrations (0.5%-10% dry rubber content, DRC) and immersion temperatures (30-70 °C) on the film characteristics were studied. It was revealed that the combination of nanocellulose fibrous networks and NR polymer provided a synergistic effect on the mechanical properties of NR-BC films. In comparison with BC films, the tensile strength and elongation at break of the NR-BC films were considerably improved ~4-fold. The NR-BC films also exhibited improved water resistance over that of BC films and possessed a high resistance to non-polar solvents such as toluene. NR-BC films were biodegradable and could be degraded completely within 5-6 weeks in soil.