Characterization of oxygen scavenger polymeric active film for packaging / Caracterização de filme ativo polimerico com absorvedor de oxigenio para uso em embalagem

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Studies indicate that the main factor to be controlled to warrant the quality in packaged products is the oxygen concentration. This controlling can be determinant in the products shelf life. In this work, system (?absorption cell?) and methodology had been developed for characterize an active film containing low density polyethylene and a kind of oxygen scavenger additive dispersed throughout the polymer carrier, that, in the application, is part of a multilayer system packaging. This additive is activated by humidity contact and acts in a way of scavenging oxygen inside the packaging. The active film characterization consisted in determining the capacity and speed of oxygen scavenging by the film, that was kept inside the cell, where was carried out the oxygen concentration controlling by gas chromatography. The study of the temperature and the relative humidity influence in the oxygen scavenging was conducted by an experimental design composite 22. The additive dispersion in the polymer carrier (Optical microscopy), the surface roughness (MEV), the light transmission (spectrophotometry UV-visible) and the resin crystallization degree (DSC) were studied as well. The results indicated that the variable with the most influence in the oxygen scavenging was the relative humidity and the film showed the maxim scavenging and speed in temperatures above 15°C and relative humidity above 81,2%. The additive dispersion and the film surface roughness showed better results in film with concentrations above 5%. The film shows transparence lost even for low additive concentration (1%). The film crystallization degree reduces with the increase of additive concentration, this can promote the oxygen diffusion in the resin benefiting the contact between the additive and the oxygen and, though, it increases the scavenging by the film

ASSUNTO(S)

polietileno experimental design composite sheld life planejamento experimental plastic package filmes plasticos oxygen scavenger alimentos - embalagens polyethylene active package embalagens plasticas

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