Abstract
Environmentally benign, biodegradable materials derived from renewable resources are gaining great consideration in recent times. Food packaging requires FDA approved, lightweight and low cost materials with superior barrier properties for extended shelf life and good flavor/aroma retention. In the present study, polylactic acid (PLA) modified with triethyl citrate (TEC) as a bioplasticizer was reinforced with copper nanoparticles and tested for possible improvement in mechanical and barrier properties. The increase in TEC content upto 8 wt% improved the toughness, beyond 8 wt% there was a decrease in tensile strength and modulus. A nanocomposite film of PLA/TEC/copper nanoparticle (92/8/3 wt%) displayed better barrier properties and optimum mechanical strength. The water vapor permeability and oxygen permeability rate was drastically decreased upon addition of nanocopper.
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