Page 329 - 00. Complete Version - Progress Report IPEN 2014-2016

Materials and Nanotechnology | Progress Report 329

sented compatible results between scission and aromatic hydrocarbons; physical resis-
and crosslinking and, so, they were selected tant to high temperature; low gas permeabil-
for the mixtures between pristine and recov- ity; and others. The inorganic nanoparticles
ered rubber. The assessment of physical-chem- are clay and a silsesquioxane polymer (POSS).
ical properties of compounds comprising re- The objectives of the use of these particles are
covered rubber showed that the addition of improving the mechanical property, reducing
recovered rubber via irradiation and shear- the swelling of the elastomer and maintain-
ing favors a slight decreasing in tensile and ing the dimensional stability. The incorpora-
elongation at break. Nevertheless, results in- tion was carried out by mixture process in a
dicate a compatibility of this incorporation. In two roll cylinder at room temperature. After
summary, it was possible to conclude that, in the incorporation, the samples were pressed
spite of further adjustments in formulations, in order to vulcanize and to obtain films with
containing recovering of butyl and halobutyl 0,2mm thickness. The films will be submit-
rubbers, the strategy of a previous irradiation ted to gamma radiation to induce graft po-
and a further shearing showed a great poten- lymerization by simultaneous method. After
tial in recycling scenery. irradiation, the films will be immerse) in the
sulfonation solution to complete the experi-
Development of sulfonates mental part.
multifunctionals fluoroelastomers
based on nanocomposites. Issues on hydrogels for drug delivery.

Polymer nanocomposite is a material formed Hydrogels for wound dressings are usu-
by a polymer matrix and, usually, an inorganic ally developed for contact surfaces where
compound. This inorganic material has nano- mechanical properties are conveniently re-
meters with size of 100nm and is dispersed in quired. In this sense, nanocomposite hydro-
the matrix. These nanocomposites have been gels based on poly(vinyl alcohol) (PVAl) and
studied in Universities and industries because poly(N-2-vinil-pirrolidone) (PVP), containing
of the final properties presented by this kind of 0.5 - 1.5 wt% of the synthetic laponite RD clay,
material. The combination of properties of or- were prepared by gamma radiation process
ganic and inorganic materials revealed an im- and compared with similar membranes com-
provement of mechanical, thermal, electrical posed separately of PVP or PVAl. This study
and optical properties. In the case of nanocom- aimed to evaluate the effect of clay on the
posites, the same behavior was noticed due to properties and the differences of the poly-
the incorporation of inorganic nanoparticles mer binary system instead of a one polymer
in the polymer chain. In this work, the effect nanocomposite hydrogel. The morphology of
of incorporation of inorganic nanoparticle in the hydrogels was evaluated by spectrometric
the fluoroelastomer matrix has been study- techniques using X-Ray Diffraction, scanning
ing. The selection of materials is very import- electron microscopy (SEM), swelling, and In-
ant because the mixture process and quality frared Spectroscopy (FTIR). Swelling kinetics at
of final product. 22 °C and mechanical properties by tensile test
evaluated the structural properties. The results
The fluoroelastomer has been selected as the showed PVA/PVP network depends directly of
matrix polymer because of its properties, such the clay concentration in the nanocomposite
as: solubility; chemical resistant to aliphatic hydrogels. The blend PVP/PVAl proved to have