ARAÚJO, J. P.; DE ARAÚJO, JEANE P.; ARAÚJO, JEANE P.; http://lattes.cnpq.br/5126842862206600; ARAÚJO, Jeane Paulino de.
Abstract:
Poly (lactic acid) (PLA) is a widely investigated and promising biopolymer, however, it
has limitations, such as high brittleness, being necessary to modify its properties. In
this work, through blends obtained in a torque rheometer, the reactivity of the
polyethylene grafted with acrylic acid (PEgAA) copolymer with the ethylene/acrylate
methyl (EMA), ethylene/glycidyl methacrylate (EGMA) and ethylene/methyl
acrylate/glycidyl methacrylate (EMA-GMA) copolymers, and the reactivity of EGMA
and EMA-GMA with PLA was evaluated. The blends were characterized by
differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy
(FTIR). Subsequently, the effect of the combined copolymers and the mixing
sequence on the morphology, rheological, mechanical, and thermo-mechanical
properties of PLA matrix ternary blends was also studied. The analyzes showed the
occurrence of reactions between PEgAA and EGMA and between PEgAA and EMA-
GMA. PEgAA was found to be more reactive with EGMA than with EMA-GMA.
PEgAA reactivity with EGMA and PEgAA reactivity with EMA-GMA increased with
increasing temperature. The mixing sequence affected the rheological properties and
morphology of the PLA/EGMA/PEgAA and PLA/EMA-GMA/PEgAA blends. Blends
containing EMA-GMA copolymer showed higher impact strength than blends
containing EGMA copolymer. In general, relevant information on reactivity between
copolymers and mixing sequences has been obtained and can be used for the
development of other systems with PLA or other polymeric matrices.