Influência do polipropileno modificado com anidrido maleico nas propriedades mecânicas e térmicas de compósitos de polipropileno com resíduos de concha calcinados

Abstract

In this work the mechanical, morphological, thermal and flow properties of polypropylene (PP) composites with 8% by mass of calcined mollusc shell (CC) were evaluated, with modifications of 2, 6 and 8% by mass of PP modified with maleic anhydride (PPAM). This research aims at the reuse of mollusc shells, which are sources of calcium carbonate (calcite and aragonite), and are found by the coast of Paraíba, in the mollusc species Mytilus edulis. Physical mixtures of PP and composites were performed using a single screw extruder to verify the effect of PPMA on its properties. The fluidity of the samples (PP / CC) was altered and decreased with increasing PPAM content. The impact resistance of the composites was lower than that of the PP matrix, with the composite with 2% PPAM showing better results among the others. The modulus under flexural strength of the composites was larger than that of the PP, with an increase of 18% for the composite with 2% of PPAM, while the other mechanical properties of the composites were practically unchanged compared to the matrix. From the thermogravimetric analysis, it was observed that the composite with the only calcined shell (PP / CC) was the one with the lowest residual content and the initial degradation temperature lower than the PP, around 28%. The composite with 2% of PPAM was the one that presented better thermal behavior among the other composites. The modification with PPAM resulted in composites with higher contents of inorganic residues and better properties than the composite with only calcined shell