Desenvolvimento de bionanocompósitos de poli (ácido lático)/argila organofílica.

Abstract

Poly (lactic acid) - PLA is a polymer of the poly (α-hydroxy) class. acids), one of the most attractive and promising polymer families. This one biopolymer has been studied as an option for the production of disposable articles to replace petroleum-derived polymers, thus contributing to the preservation of the environment. However, this biopolymer has some disadvantages that limit its use in some applications. An alternative to improving PLA properties and mixing it with other polymers or with small amounts of clay. Therefore, this work aimed to develop bionanocomposites to from the PLA / organophilic clay system. Initially bentonite clay Brasgel was treated with Praepagem WB® salt and subsequently The properties of modified clay were evaluated. After organophilization, it was A 1: 1 PLA / OMMT concentrate is prepared in a internal mixer Then mixtures of PLA / Impact Modifiers (EMA and E-GMA) / OMMT on Twin-screw Extruder co-rotating and also specimens were molded by the process injection The clay characterization tests showed by means of DRX, FRX, TG and FTIR salt has been incorporated into the clay structure. confirming its organophilization. X-ray Diffraction Results indicated that bionanocomposite with partially exfoliated structure was obtained for the composition PLA / OMMT / E-GMA, while for the PLA / OMMT / EMA composition confirmed the presence of structures partially exfoliated / interspersed. The thermal properties of HDT do not presented a decrease in their values ​​compared to those of the PLA. To the mechanical properties, elastic modulus and tensile strength decreased with respect to PLA, while impact resistance increased considerably for all systems except the PLA / OMMT.