Page 330 - 00. Complete Version - Progress Report IPEN 2014-2016

330 Materials and Nanotechnology | Progress Report

mechanical properties of stress tensile modu- showed optimum dispersion at intercalation/
lus higher than PVAl nanocomposite and high- exfoliation levels for polyethylene nanocom-
er elongation compared to PVP nanocompos- posite (PENC), slight increasing in mechanical
ites. Hydrogels of PVP were formulated with and especially improvement in thermal prop-
neomycin followed by radiation in gamma erties. Polyethylene is widely used for packing
source for crosslink and sterilization. The an- applications. Different grades of polyethylene,
tibiotic neomycin released from the hydrogel LLDPE and LDPE play a major role in the film
crosslinked membranes was determined by blowing industry. The use of nanoclay in poly-
Liquid Chromatography – Mass Spectrometry. mer matrices (non-polar) requires the use of
The drug is released in the 20h of essay. Hy- a compatibilizer agent, ethylene graft maleic
drogel/neomycin exhibited antibacterial activ- anhydride copolymer (PE-g-MA), which acts
ity effects against Stephylococus aureus and as a bridge for nanoclay-matrix-interaction.
Pseudomonas aeruginosa, Figure 53. In our study, blown films of LLDPE, LDPE, and
their blends were produced using a twin screw
extruder. The combination of PEs as matrix,
montmorillonite (MMT) and silver nanopar-
ticles (AgNPs) intended to improve mechani-
cal and thermal properties. Nanocomposites
films with 1 wt% of montmorillonite and 0.5–
Figure 53. (A/B/C). Antibacterial results of activity against: con-
trol(A), P aeruginsa (B); S. aureus (C), after 24 h of incubation at 37°C. 1.0 wt% silver nanoparticles were prepared
by blow extrusion and evaluated. Nanoclay
Polymeric films for antibacterial activity intercalation/exfoliation degree was investi-

gated by X-ray diffraction spectroscopy (XRD)
Polyethylene is widely used for packing appli- and scanning electron microscopy (SEM). Me-
cations. Different grades of polyethylene, LLDPE chanical and thermal properties were evalu-
and LDPE play a major role in the film blowing ated. The results showed optimum dispersion
industry. The use of nanoclay in polymer ma- at intercalation/exfoliation levels for polyeth-
trices (non-polar) requires the use of a compat- ylene nanocomposite (PENC), slight increasing
ibilizer agent, ethylene graft maleic anhydride in mechanical and especially improvement in
copolymer (PE-g-MA), which acts as a bridge thermal properties.
for nanoclay-matrix-interaction. In our study,
blown films of LLDPE, LDPE, and their blends X-ray diffraction spectroscopy of sample PENC/
were produced using a twin screw extruder. AgNP1.0% showed intercalated morphology.
The combination of PEs as matrix, montmo- The results with MMT indicated the formation
rillonite (MMT) and silver nanoparticles (Ag- of microstructures predominantly exfoliated
NPs) intended to improve mechanical and ther- in film PENC1. In SEM/EDS microscopy the
mal properties. Nanocomposites films with 1 morphology of the silver/clay particles with
wt% of montmorillonite and 0.5–1.0 wt% sil- homogeneous distribution. The film PENC/
ver nanoparticles were prepared by blow ex- AgNP0.5% showed increase of elongation at
trusion and evaluated. Nanoclay intercalation/ break above 1000%, which suggests the ap Pro-
exfoliation degree was investigated by X-ray cessing starch biodegradable nanocomposites.
diffraction spectroscopy (XRD) and scanning
electron microscopy (SEM). Mechanical and Polymer-clay nanocomposites (PCN) based on
thermal properties were evaluated. The results cassava starch, synthetic hectorite clay and

Instituto de Pesquisas Energéticas e Nucleares