Limits...
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.


Electrical and mechanical behavior in nanocomposites obtained by crystallization from the melt. (a) Dielectric response as a function of frequency and composition (b) Dynamical mechanical response
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211319&req=5

Figure 3: Electrical and mechanical behavior in nanocomposites obtained by crystallization from the melt. (a) Dielectric response as a function of frequency and composition (b) Dynamical mechanical response

Mentions: Figure 3a shows the decline of relative dielectric constant according to increasing frequency from 100 Hz to 1 MHz, which revealed the typical model of anomalous dispersion. At a closer inspection, it is demonstrated that incorporating Co-MgO particles increase the dielectric constant for the nanocomposite samples when compared to the pure α-PVDF matrix. The maximum is obtained for the lowest concentration of 0.02 wt.% the decrease in the dielectric constant between 0.2 and 2 wt.% loadings may be a signature of dipolar interactions influencing the nanoparticles intrinsic magnetic properties [12].


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)

Electrical and mechanical behavior in nanocomposites obtained by crystallization from the melt. (a) Dielectric response as a function of frequency and composition (b) Dynamical mechanical response
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: Electrical and mechanical behavior in nanocomposites obtained by crystallization from the melt. (a) Dielectric response as a function of frequency and composition (b) Dynamical mechanical response
Mentions: Figure 3a shows the decline of relative dielectric constant according to increasing frequency from 100 Hz to 1 MHz, which revealed the typical model of anomalous dispersion. At a closer inspection, it is demonstrated that incorporating Co-MgO particles increase the dielectric constant for the nanocomposite samples when compared to the pure α-PVDF matrix. The maximum is obtained for the lowest concentration of 0.02 wt.% the decrease in the dielectric constant between 0.2 and 2 wt.% loadings may be a signature of dipolar interactions influencing the nanoparticles intrinsic magnetic properties [12].

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.