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Processing and characterization of thermoplastic corn starch-based film/paper composites containing microcrystalline cellulose.

BACKGROUND
Different thermoplastic starch (TPS) films were prepared with or without the addition of microcrystalline cellulose (MCC) obtained via melt-extrusion method, then hot-press method was used to produce environmentally friendly TPS-based film/paper composites to replace petroleum-based materials.


RESULTS
The paper-plastic composites exhibited good interfacial adhesion from the SEM images. It was seen that 5wt.% MCC was added to reinforce the mechanical properties of TPS films, so that it also improved the barrier properties of MCC@TPS/Paper composites and extended the path of water vapor through TPS films, which decreased the water vapor transmission rate of MCC@TPS/Paper composites. TPS/Paper composites and MCC@TPS/Paper composites have better physical properties (i.e. smoothness, flexibility and folding resistance) than only paper. In particular, it was found that the water contact angle of MCC@TPS/Paper composites and TPS/Paper composites were higher than single-layer paper. Furthermore, MCC reinforced paper-plastic composites demonstrated good barrier properties which can meet the requirement of lower water sensitive materials in food packaging industry.


CONCLUSION
Thermoplastic corn starch-based film/paper composites have good application properties as a potential source of bioplastic materials. This article is protected by copyright. All rights reserved.