Filler's impact on structure and physical properties in polyester resin–oxide nanocomposites

Impact of nanosized oxide particles of titania (titanium dioxide, rutile) and silica–titania fumed compound on structure relaxation processes in nanocomposites of an orthophtalic unsaturated styrene cross-linked polyester resin has been experimentally studied using the thermal desorption mass spectr...

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Bibliographic Details
Published in:Adsorption science & technology 2018-02, Vol.36 (1-2), p.549-570
Main Authors: Gorelov, Borys M, Gorb, Alla M, Polovina, Oleksiy I, Wacke, Sylwester, Czapla, Zbigniew, Kostrzewa, Marek, Ingram, Adam
Format: Article
Language:English
Subjects:
Crosslinking
Dielectric properties
Electron density
Molecular structure
Nanocomposites
Nanoparticles
Organic chemistry
Physical properties
Polyester resins
Polyesters
Positron annihilation
Positronium
Positrons
Silicon dioxide
Spectrum analysis
Styrenes
Thermal resistance
Titanium dioxide
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Summary:Impact of nanosized oxide particles of titania (titanium dioxide, rutile) and silica–titania fumed compound on structure relaxation processes in nanocomposites of an orthophtalic unsaturated styrene cross-linked polyester resin has been experimentally studied using the thermal desorption mass spectroscopy, the dielectric spectroscopy, and the positron annihilation lifetime spectroscopy. All the nanocomposites showed unmonotonous variations in the thermal resistance, the dielectric permittivity and losses, and the annihilation rates for both positrons and ortho-positronium atoms with increasing filler’s loading. The nanoparticle-loading effects can be explained on the assumption that the oxide particles embedded into a cross-linked polyester resin induce rearrangements in its structure. Several mechanisms of particle–polymer interface interaction compete simultaneously and thus promote the alterations in molecular structure of the nanocomposites. The mechanisms may include both chemical and electrostatic fastening of polyester chains and styrene cross-links to the active surface sites, the destruction of the styrene cross-links, and redistribution of electron density in polymers. The features of the loading effects observed in the different nanocomposites can be ascribed to distinctions in both of active surface sites and intrinsic dielectric properties of the filling oxide particles.
ISSN:0263-6174
2048-4038
DOI:10.1177/0263617417706797