Obtenção de bionanocompósitos de blendas PLA/PBAT com argila organofílica.

Abstract

This study aimed to develop bionanocomposites from blends of Polylactide (PLA)/Poly(butilene adipate-co-tereftalico) (PBAT) and Bentonite clays using of 3 and 6%. Initially, the bentonite clay was treated with Praepagen salt and evaluated the properties of the modified clay. After confirmation of organophilization clay, mixtures were prepared from PLA/PBAT 50:50 in the proportion and added clay in the contents of 3 and 6%. In order to verify the dispersion system was performed a mixing sequence of eight different conditions of addition of the clay in the matrix of PLA/PBAT. The mixtures were prepared in a twin screw extruder and then were moulded specimens by the injection process. The characterization tests of the clay showed through - ray diffraction (XRD) that salt was incorporated into the clay structure thus confirming its organophilization. The DSC curves showed the characteristic transition temperatures of polymers PLA/PBAT as well as the blend PLA/PBAT and systems PLA/PBAT/Clay(OMMT). The thermal properties of HDT showed no decrease in their values. For the mechanical properties of yield stress, strain, tension and flexure, elasticity modulus showed an increase with the addition of nanoparticles. PLA/PBAT/Clay(OMMT) systems were submitted XRD tests d001 peaks dislocations confirming the intercalation of the polymer chains in the clay layers, indicating the formation of bionanocomposites. Finally, the bionanocomposites obtained by different sequences were submitted to a previous study of biodegradation and was observed that the clay presence accelerated the biodegradation the process the studied systems.