Bionanocomposite Polylactic Acid/Organoclay Films: Functional Properties and Measurement of Total and Lactic Acid Specific Migration

摘要

The aim of the work was to manufacture, using a laboratory-scale film production pilot plant, nanocomposite polylactic acid (PLA) films added with Cloisite 30B clay-derived nanofiller having one nanometric dimension, and to characterize and to assess the migration of the obtained systems, in view of food packaging applications. The study demonstrated that it is possible to obtain nanocomposite PLA films with intercalated/exfoliated morphology of the dispersed layered nanofiller using conventional film production technologies. With increasing the silicate content in the film, the developed systems show a marked improvement of the mechanical performance, with a rise in the modulus and in the elongation at break with respect to the unfilled PLA, a significant lowering in the oxygen permeability and a slight increase in the surface wettability, without given significant alteration of film transparency and chromatic perception. Compared with the unfilled PLA, no significant changes can be observed about the migration behaviour of the nanocomposite PLA systems. In fact, both the overall migration and the specific migration, measured as lactic acid, remain always well below the applicable generic specific migration limit of 60 mg/kg food (10mg/dm~2) of the Regulation EU 10/2011.