The Study On Preparation And Characterization Of Biodegradable Cellophane Composite Film

Improvements in barrier properties and mechanical properties of Cellophane (PT) will be beneficial for the current applications and should also lead to applications in pharmaceutics’packaging and particularly packaging of food products which are sensitive to vapour and oxygen.PT is made with wood pulp, cotton pulp and other natural fibers as raw materials, through a series of processing technology made into film. It is transparent, non-toxic and tasteless, completely degradable, and it has a strong barrier to oily, alkali and organic solvent. However, the application in food packaging is greatly limited due to its high water-absorption and poor mechanical properties.In this work, PT composite film had been prepared into different thickness by coating with different concentrations of potly(e-caprolactone)(PCL) and poly(propylene carbonate)(PPC) respectively. In order to improve the compatibility of PT and PCL (or PPC), Chitosan (CS) had been coated as a compatibilizer between PT and polymer layers.The PT/PCL, PT/CS/PCL, PT/PPC and PT/CS/PPC composite films had been successfully prepared by coating technique, and its effect on barrier properties and mechanical properties had been thoroughly studied. It is shown that the PT composite films exhibit much better water vapor permeation resistance than PT, and these films still keep the high oxygen barrier. The Young’s modulus and tensile strength of PT composite films are slightly decreased, and their elongation at break is increased by coating. Also, the barrier properties of PT composite films are increased with the increase of the thickness of coating materials.