Caracterización de un material compuesto de matriz de polipropileno reforzado con partículas del endocarpio de coco de la sierra mediante moldeo por compresión

Abstract

In this research, was characterized a polymer matrix composite with organic reinforcement. Through a study of variation in the mechanical properties of the H502 polypropylene from the Braskem brand caused by the use of particles from the endocarp of the palm fruit Parajubaea cocoide Burret or also known as coconut from sierra region. The variables established were the percentage by weight of the particles and their own size. The weight percentage was 5, 10 and 15% and the size was 150, 250 and 600µm. As the compatibilizing agent, 3% by weight of polypropylene grafted maleic anhydride (MAPP) was used. The composite materials were obtained by extrusion to homogenize the polypropylene- reinforcement mixture, then by compression molding the tables of the different compositions were obtained and finally the tables were cut to obtain the different test pieces. Density, fluidity index, tensile, flexure, impact and differential scanning calorimetry (DSC) tests were performed.

Based on the results obtained, it was observed that the composite materials suffered a decrease in their different mechanical properties due to the porosities present. The imperfections occurred in the degassing stage in the extrusion process. After data analysis, it is concluded that 15%-600µm composite material got the smallest decreases in properties during the tensile test, which showed a 42% decrease in its resistance and a 2,7% reduction in its deformation. After the flexion test, it was concluded that 10%- 250µm composite material had a decrease of just 6% in its resistance in this test.