Investigation of the effect of titanium dioxide and clay grafted with glycidyl methacrylate by gamma radiation on the properties of EVA flexible films
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2020
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Radiation Physics and Chemistry
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Many studies report that nanocomposites obtained by dispersion of a small amount nanofiller into the polymer
have remarkable improvements achieved in the mechanical and physical properties. However, in order to
achieve this great improvement in properties, it is necessary that the nanofillers be dispersed homogeneously
into the polymeric matrix. Often this dispersion is difficult to achieve due to the high interfacial energy of the
nanoparticles present. This study reports the effect of gamma irradiation induced graft of glycidyl methacrylate
(GMA) onto the surface of TiO2 and Clay nanofillers to improve their dispersion into the EVA matrix. The
physical and mechanical properties of Ethylene-vinyl acetate copolymer (EVA) flexible films with these nanoparticles
were studied. EVA nanocomposite with adding of the different amount of TiO2 and modified montmorillonite
clay grafted and un-grafted with glycidyl methacrylate (GMA) using gamma irradiation have been
prepared by melt extrusion. The nanocomposite flexible films were produced using a flat die extrusion process.
The PGMA-grafted nanofillers were characterized by XRD and TEM analysis. The flexible films were characterized
by Tensile tests, ATR–FTIR, UV–VIS, XRD, TG, and FE-SEM analysis to understand the nature of the
interaction between the nanofillers and EVA matrix. The results showed that the addition of PGMA-grafted TiO2
and Clay nanofillers into EVA matrix improved the bonding between the nanofillers and matrix. It was also found
that the PGMA-grafted nanofillers could be well dispersed into an EVA matrix in contrast to that of un-grafted.
The tensile strength and modulus of the resulting EVA/TiO2-PGMA enhanced in comparison to that of un-grafted
TiO2. The EVA/Clay-PGMA had slightly decreased tensile strength comparable to that of EVA/Clay but had
considerably improved elastic modulus. In addition, the flexible films based on TiO2 exhibited high UV–Vis light
absorption with energy gap shifted to the visible region. The results demonstrated that TiO2 and Clay nanofillers
grafted with GMA by gamma radiation can be used to prepare EVA flexible films with improved bonding between
the nanofillers and matrix and, consequently, enhanced properties for food and cosmetic packaging application.
Como referenciar
BARTOLOMEI, SUELLEN S.; SANTANA, JULYANA G.; DIAZ, FRANCISCO R.V.; KAVAKLI, PINAR A.; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B. Investigation of the effect of titanium dioxide and clay grafted with glycidyl methacrylate by gamma radiation on the properties of EVA flexible films. Radiation Physics and Chemistry, v. 169, p. 1-9, 2020. DOI: 10.1016/j.radphyschem.2018.08.022. Disponível em: http://repositorio.ipen.br/handle/123456789/31073. Acesso em: 22 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.