MEDEIROS, V. N.; http://lattes.cnpq.br/5520550843636835; MEDEIROS, Vanessa da Nóbrega.
Abstract:
The polymer nanocomposites have been potentially considered in recent
decades due to an improvement in the properties presented by these materials,
mainly used by low levels of load. Among the applications of the
nanocomposites, in particular an increase interest which is to obtain
membranes. Processes using membranes, although recently, have been used
increasingly with operations of separation, purification, concentration and
fractionation in a wide variety of industries. In this study, membranes from
poly(ether imide) (PEI) and poly(ether sulfone) (PES) nanocomposites with
montmorillonite clay were produced by the solvent evaporation technique, using
as solvent: chloroform to the PEI and dimethylformamide (DMF) to the PES. By
XRD it was seen intercalated structures for the PEI with 3% clay and a
microcomposite to 5% PEI and PES. By SEM it was observed that the
membranes did not present apparently pores. By TG, two stages of
decomposition were visualized and the clay increased the thermal stability of
the membranes. By DMTA it was observed that the incorporation of clay into
matrix increased the rigidity of the system, increased Tg and improved
thermomechanical stability. Through permeation analysis it was found that for
water vapor and 0 2 permeation is greater for the PES membranes. The
incorporation of the clay decreased permeability to 0 2 for both polymers, thus
proving that served as the clay barrier.