[article]
| Titre : |
Development of an immiscible polymer/polymer/nanoparticle system to assess the location of nanoparticles by quantitative optical microscopy |
| Type de document : |
texte imprimé |
| Auteurs : |
L. H. B. Johansen, Auteur ; L. B. Canto, Auteur ; S. V. Canevarolo, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 607-617 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Alliages polymères
Composites thermoplastiques
Microscopie
Morphologie (matériaux)
Nanoparticules
Polycarbonates
Polystyrène
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The thermo-optical behavior of immiscible PS/PC blends filled with silica nanoparticles was studied in order to get some information upon the location of nanoparticles in the polymer blend phases and interface using optical microscopy. The systems were designed taking into account rheological and optical requirements, having droplet-matrix morphology, with particle size in the range of the visible light wavelength. The melt blending procedure helped to set the nanoparticles at specific locations including within the PC minor phase, PS matrix phase and PS/PC interphase, which was confirmed via transmission electron microscopy. The light scattering was measured via the normalized transmitted light intensity over temperature, encompassing the Tg of the two polymers. The PS/PC blends showed an increase in the light scattering as compared to the pure polymers, which is magnified upon increasing the PC content. The addition of the nanosilica forming PS/PC/Nanosilica systems greatly reduces the light scattering, particularly above the Tg of the PS phase. The use of hydrophilic nanosilica does not show any appreciable hysteresis upon comparing data from heating and cooling cycles. This type of silica stays mainly trapped within the PC dispersed phase, little interfering with the light scattering, which happens at the polymer-polymer interface. On the other hand, the use of hydrophobic nanosilica does show a clear hysteresis. The hydrophobic silica located at the PS/PC interphase, interfere with the light scattering intensity at this interface, and can be used to identify its presence. The proposed procedure can help control the mixing process, thus improving the effective action of the nanoparticles in the final properties of polymer systems. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Polymer blending procedure - Phase morphology characterization - Transmitted light intensity quantification
- RESULTS AND DISCUSSION : Designing the polymer-polymer-nanoparticle system - Morphology visualization via transmission electron microscopy - Quantitative optical microscopy - |
| DOI : |
10.3139/217.3241 |
| En ligne : |
https://drive.google.com/file/d/1WYb-gYg0UrR9gSXTe0dtiHEPCF3V27Yo/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27398 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 5 (11/2016) . - p. 607-617
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