Institution: | aLaboratório de Polímeros Biodegradáveis e Soluções Ambientais, Programa de Pós-Graduação Stricto Sensu em Engenharia e Ciência dos Materiais (PPG-ECM), Universidade São Francisco, Rua Alexandre Rodrigues Barbosa, No 45, Centro, CEP 13251-900, Itatiba, SP, Brazil bCPqD Foundation in Telecommunication, Campinas, SP, Brazil cDepartment of Materials, São Carlos University, Campinas, SP, Brazil dFaculty of Chemical Engineering, State University of Campinas (UNICAMP), Campinas, SP, Brazil |
Abstract: | Microscopy and mechanical properties are commonly used to follow the changes in morphology and mechanical resistance, respectively, of materials before and after any type of treatment. In this work, we used light microscopy (LM), scanning electron microscopy (SEM) and measurement of the mechanical properties to assess the natural ageing of samples of isotactic polypropylene (iPP) in Campinas and after exposure to Weather-Ometer type accelerated ageing equipment. The results obtained for the mechanical properties and by light microscopy (LM) allowed us to identify the ageing time based on the amount of radiation, for a 50% loss of elongation at break. The results were similar for samples subjected to the two types of ageing processes. Although a simple technique, LM was considered efficient when compared with SEM and the measurement of mechanical properties. |