Propriedades mecânicas de filmes respiráveis de PELBD

Abstract

Breathable films have an expressive technological relevance, as they are widely used from application in disposable diapers to agricultural components. They are predominantly produced through polyethylene (PE) resins along with the addition of mineral load containing calcium carbonate (CaCO3), which confers porosity to the film when subjected to stretching. In general, 40-50 % calcium carbonate is used in polymer matrix to obtain thin films at high coiling speed rate. This work proposes to compare the tensile, tearing and essential fracture work (EWF) tests in order to determine the mechanical properties of breathable film. Through this work it was possible to observe that the pure PELBD is more resistant than the coupled material, both in mean stress values and in the EWF parameters approached. The coupled material presents a phenomenon of disentanglement of the polymeric fibers, diminishing the mechanical resistance punctually.