ABSTRACT
This chapter discusses the properties of plastics most relevant to packaging applications. General description of thermal, mechanical, and barrier properties of polymers is provided. Properties of most common packaging plastics such as polyethylene and polystyrene are detailed next. Bio-based plastics (PLA, PHA, chitosan, and so on) for packaging applications are discussed as an eco-friendly, sustainable alternative to conventional packaging plastics. In several instances, polymer nanocomposites exhibit superior properties compared to neat, unfilled polymer. Property enhancements associated with incorporation of different nanofillers in the polymer matrix are discussed in the context of packaging applications. Focus is on the improvement of mechanical and barrier properties. Novel packaging techniques such as modified atmosphere packaging and active packaging where the role of packaging goes beyond that of simple containment and protection are reviewed as well. Finally, food-packaging interactions in terms of migration of chemicals from packaging material to foodstuff are discussed.
1.1 INTRODUCTION
