KOJUCH, L. R.; http://lattes.cnpq.br/3964523666390921; KOJUCH, Luana Rodrigues.
Resumen:
Microporous membranes were obtained from nanocomposites of polyamide 6.6
with 1 and 3% of national bentonite clay, by phase inversion process. It was
used two kinds of precipitation bath: with distilled water and a of formic acid.
The nanocomposites were obtained from the intercalation by melting technique
and presented exfoliated and / or partially exfoliated structure as shown by
XRD. By differential scanning calorimetry (DSC), it was observed that the
presence of the clay did not significantly alter the melting temperature of the
nanocomposites when compared with the pure polyamide. The membranes
were characterized by SEM, XRD, measurements of flow and water vapor
permeation. In general, asymmetric membranes showed a morphology detected
by SEM: A selective layer and a porous layer with variations in its
microstructure. The precipitation bath with acid solution led to a decrease in the
thickness of the selective layer of the membranes compared to membranes
obtained in a precipitation bath of water. In general, the membranes with 1%
clay and water bath precipitation showed relatively good permeate flux for all
used pressures (1, 2 and 3 bar). For membranes obtained from a
precipitation bath in a acid solution gave a gradual increase in water vapor
permeation, as it increased the clay content. For membranes obtained from
a precipitation bath with water, there was a significant reduction in the
permeability in relation to the pure PA 6.6, in the range of 66 to 48% for
membranes with 1% and 3% of clay, respectively. Therefore, microporous
membranes obtained from nanocomposites were obtained, and the
precipitation bath type and the amount of clay influenced on the morphology
and permeability of the membranes.