Avaliação das propriedades mecânicas e de barreira de filmes de EVA/Argila
Polymer films based on ethylene vinyl acetate (EVA) were produced in this work, as well as nanocomposites of EVA and Cloisite 20A clay. These films and nanocomposites were produced with two different solvent types, chloroform and tetrahydrofuran by the solvent evaporation technique. Compositions...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27984 |
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| Resumo: | Polymer films based on ethylene vinyl acetate (EVA) were produced in this work,
as well as nanocomposites of EVA and Cloisite 20A clay. These films and nanocomposites
were produced with two different solvent types, chloroform and tetrahydrofuran by the
solvent evaporation technique. Compositions 3% and 5% clay by weight with respect to the
polymer weight were used for the production of nanocomposites, both using chloroform as
solvent, such as tetrahydrofuran. To evaluate the influence of the type of solvent and the
addition of clay in the polymer matrix on the properties of the films the techniques of x - ray
diffraction, Fourier transform infrared, contact angle, water vapor transmission rate,
thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy
and tensile strength were used. The x-ray diffraction showed a dispersion of the clay in the
films. The Fourier transform infrared showed that the addition of clay as well as the use of
the different solvents did not modify the characteristic bands of the film. From the results
obtained by the water vapor transmission test an increase of the barrier properties of the
films with the addition of clay and a greater homogeneity in the results obtained using
tetrahydrofuran as solvent can be verified. The contact angle characterization showed that
the addition of clay in the polymer matrix caused a change in the hydrophobicity of the
films. The thermogravimetric analysis evidenced an increase in the temperature for
beginning of degradation with the addition of clay. The exploratory difference calorimeter
analysis showed a decrease of the crystallinity with addition of the clay. However, the
melting temperatures did not change significantly. Microscopy analysis revealed dense
structures of the films. The addition of clay promoted an increased stiffness of the films. In
general, the addition of clay to the polymer matrix improved the mechanical and barrier
properties of the films. |
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