Desarrollo y caracterización de filmes multicapas en base polietileno entrecruzado mediante radiación tipo beta

Abstract

The main objective of this doctoral thesis has been the characterization of commercial films of low density polyethylene (LDPE) subjected to morphological and structural changes through the use of physical methods, specifically Beta-type ionizing radiation (between 25 - 200 kGy of ionizing radiation) , for the development of products with improved properties for the packaging. This treatment has acted modifying the configuration of the polymeric matrix, and it has been proved that the increase in radiation increases the percentage of crosslinking, defining, in general, a maximum value at high doses, and then decaying to higher doses due to a process of chain splitting. Clearly modifying the properties of the irradiated film. These results have been influenced by the molecular orientation (machine direction or transverse direction), which has been conditioned by the process parameters (blow ratio). Finally, it has been proven that the cost of the treatment of ionizing radiation is within the standard costs in the market. Its use in industrial processes would be justified technically and economically since it allows to improve the properties of the containers with an adjusted investment in equipment and a minimum modification of the processes.