CAVALCANTI, S. N.; http://lattes.cnpq.br/8040696625381064; CAVALCANTI, Shirley Nóbrega.
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.
