Influência de argilas organofílicas e de copolímeros nas propriedades de biocompósitos de poli (ácido lático).

Abstract

Biocomposites biopolymer / clay and biopolymer / clay / copolymer were prepared by extrusion followed injection, which assessed the levels of two kinds of clay (bentonite and vermiculite) organophilizated and two copolymers (ethylene - methyl acrylate - glycidyl methacrylate ) EMA-GMA - (EG) and (styrene- (ethylene-butylene) styrene with maleic anhydride Graphite) - SEBS-g-MA on the properties of biocomposites. The compositions were prepared with percentages of clay 1, 3 and 5 phr to PLA biocomposites / clay for biocomposites PLA / copolymer / clay set up a clay content of 3 phr and added 20% copolymer in mixtures. The clays were organophilizated using a surfactant based on the percentage of cation exchange capacity. To evaluate the effect of change in PLA systems were characterized by the techniques of X-ray Diffraction (XRD), Mechanical Testing of Tensile and Impact, Scanning Electron Microscopy (SEM) and oscillatory rheological tests and Permanent. The results of XRD and FTIR suggested that the salt was incorporated into the structure of vermiculite and bentonite clays organophilic thus confirming their organophilization. For biocomposites results indicated that the addition of clays (OMMT and OVT) to the PLA did not favor the formation of bionanocompósitos, and thus not significantly altering the properties of biocomposites. While the addition of 20% by weight of EG and SEBSgMA copolymers with a content of 3 phr of clay, led to the formation of interleaved and or exfoliated structures in systems with PLA and EG copolymer combined with clay OVT showed superior properties to the SEBSgMA.