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Thermal, dielectrical and mechanical response of α and β-poly(vinilydene fluoride)/Co-MgO nanocomposites.

Paleo AJ, Martínez-Boubeta C, Balcells L, Costa CM, Sencadas V, Lanceros-Mendez S - Nanoscale Res Lett (2011)

Bottom Line: Nanocomposites of the self-forming core-shell Co-MgO nanoparticles, which were of approximately 100 nm in diameter, and poly(vinylidene fluoride) (PVDF) polymer have been prepared.When the polymer is crystallized in the α-phase, the introduction of the nanoparticles leads to nucleation of the γ-phase of PVDF, increasing also the melting temperature of the polymer.With the introduction of the Co-MgO particles, the dielectric constant of the material slightly increases and the storage modulus decreases with respect to the values obtained for the pure polymer.

View Article: PubMed Central - HTML - PubMed

Affiliation: IPC - Institute for Polymers and Composites, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal. antonio.vieito@dep.uminho.pt.

ABSTRACT
Nanocomposites of the self-forming core-shell Co-MgO nanoparticles, which were of approximately 100 nm in diameter, and poly(vinylidene fluoride) (PVDF) polymer have been prepared. When the polymer is crystallized in the α-phase, the introduction of the nanoparticles leads to nucleation of the γ-phase of PVDF, increasing also the melting temperature of the polymer. With the introduction of the Co-MgO particles, the dielectric constant of the material slightly increases and the storage modulus decreases with respect to the values obtained for the pure polymer.

No MeSH data available.


Infrared spectroscopy and thermal analysis in nanocomposites obtained by crystallization from the melt. (a) FTIR absorption band attributed to O-H bonds (b) DSC thermograms.
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Figure 2: Infrared spectroscopy and thermal analysis in nanocomposites obtained by crystallization from the melt. (a) FTIR absorption band attributed to O-H bonds (b) DSC thermograms.

Mentions: These results suggest that the Co-MgO nanoparticles have an influence on polymer crystallization. A large number of studies have been focused on the crystallization of PVDF resin. For example, addition of hydrate salt Mg(NO3)2 6H2O to PVDF was shown to promote the formation of the β-phase [11]. In the case of this study, hydroxylated MgO surfaces are obtained after exposure of our particles to normal air conditions. Thus, we surmise hydrogen bonding at the interface between PVDF molecules and the Mg-OH pair can preferably lead to better-oriented packing of CH2-CF2 dipoles, which is the trans conformation. We surmise on increasing the particle loading, the stronger polarity of the hydroxyl groups. Evidences are shown in Figure 2a, the broad absorption band attributed to the hydrogen-bonded O-H stretch.


Thermal, dielectrical and mechanical response of α and β-poly(vinilydene fluoride)/Co-MgO nanocomposites.

Paleo AJ, Martínez-Boubeta C, Balcells L, Costa CM, Sencadas V, Lanceros-Mendez S - Nanoscale Res Lett (2011)

Infrared spectroscopy and thermal analysis in nanocomposites obtained by crystallization from the melt. (a) FTIR absorption band attributed to O-H bonds (b) DSC thermograms.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211319&req=5

Figure 2: Infrared spectroscopy and thermal analysis in nanocomposites obtained by crystallization from the melt. (a) FTIR absorption band attributed to O-H bonds (b) DSC thermograms.
Mentions: These results suggest that the Co-MgO nanoparticles have an influence on polymer crystallization. A large number of studies have been focused on the crystallization of PVDF resin. For example, addition of hydrate salt Mg(NO3)2 6H2O to PVDF was shown to promote the formation of the β-phase [11]. In the case of this study, hydroxylated MgO surfaces are obtained after exposure of our particles to normal air conditions. Thus, we surmise hydrogen bonding at the interface between PVDF molecules and the Mg-OH pair can preferably lead to better-oriented packing of CH2-CF2 dipoles, which is the trans conformation. We surmise on increasing the particle loading, the stronger polarity of the hydroxyl groups. Evidences are shown in Figure 2a, the broad absorption band attributed to the hydrogen-bonded O-H stretch.

Bottom Line: Nanocomposites of the self-forming core-shell Co-MgO nanoparticles, which were of approximately 100 nm in diameter, and poly(vinylidene fluoride) (PVDF) polymer have been prepared.When the polymer is crystallized in the α-phase, the introduction of the nanoparticles leads to nucleation of the γ-phase of PVDF, increasing also the melting temperature of the polymer.With the introduction of the Co-MgO particles, the dielectric constant of the material slightly increases and the storage modulus decreases with respect to the values obtained for the pure polymer.

View Article: PubMed Central - HTML - PubMed

Affiliation: IPC - Institute for Polymers and Composites, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal. antonio.vieito@dep.uminho.pt.

ABSTRACT
Nanocomposites of the self-forming core-shell Co-MgO nanoparticles, which were of approximately 100 nm in diameter, and poly(vinylidene fluoride) (PVDF) polymer have been prepared. When the polymer is crystallized in the α-phase, the introduction of the nanoparticles leads to nucleation of the γ-phase of PVDF, increasing also the melting temperature of the polymer. With the introduction of the Co-MgO particles, the dielectric constant of the material slightly increases and the storage modulus decreases with respect to the values obtained for the pure polymer.

No MeSH data available.