Caracterização das propriedades superficiais de nanocompósito polímeroargila montmorilonítica funcionalizada
Nanocomposites with thermofixed polymeric matrix and nanostructured inorganic filler have been presenting greater industrial demand in recent years. Recent research in this area seeks to incorporate filler at low percentages of mass (less than 5%) in order to maximize the properties of the nanoco...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/29943 |
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| Resumo: | Nanocomposites with thermofixed polymeric matrix and nanostructured
inorganic filler have been presenting greater industrial demand in recent years. Recent
research in this area seeks to incorporate filler at low percentages of mass (less than
5%) in order to maximize the properties of the nanocomposite without prejudice factors
such as toughness. In this work, polymer-clay nanocomposites were produced from
epoxy resin and montmorillonite clay. A content of 3 %wt of clay was incorporated into
the resin through dispersion in acetone, mechanical agitation and application of
vacuum. The nanocomposites obtained were deposited in the form of films, on
stainless steel plates. The commercial clay was treated using ethylene glycol to
remove interlamellar compounds and allow exfoliation of the structure. The material
was functionalized with three different coupling agents, denominated silanes, (3-
Aminopropyl) triethoxysilane (APTES), Triethoxyvinylsilane, (TEVS) and 3-
(Trimethoxysilyl) propyl methacrylate (MEMO). The modified minerals were evaluated
using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and
specific surface area analysis using the BET method. The analyzes suggest that the
materials obtained showed exfoliated structure before incorporation in the resin, with
the silane agents incorporated in the interlayer space of the clay, which was observed
through the significant modification in the basal spacing of its structure and modification
of specific surface area. The analyzes of atomic force microscopy (AFM) and contact
angle performed on the obtained nanocomposites indicated that the presence of
coupling agents superficially modified the nanocomposites, varying their roughness
and obtaining an increase of approximately 45% in the contact angle for the
nanocomposite containing TEVS. Materials modified with MEMO showed slight
changes in the contact angle. For the nanocomposite containing APTES, the analyzes
indicated a tendency to increase hydrophilicity. |
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