TY - JOUR
T1 - Polyvinylidene fluoride/magnetite nanocomposites Dielectric and thermal response
AU - Tsonos, C.
AU - Zois, H.
AU - Kanapitsas, A.
AU - Soin, Navneet
AU - Siores, E.
AU - Peppas, G. D.
AU - Pyrgioti, E. C.
AU - Sanida, A.
AU - Stavropoulos, S. G.
AU - Psarras, G. C.
PY - 2019/1/22
Y1 - 2019/1/22
N2 -
Nanocomposites of poly (vinylidene fluoride), PVDF, and magnetite (Fe
3
O
4
) nanoparticles were prepared using the twin screw compounding method and the effect of filler concentration (5–15 wt%) on the thermal stability, dielectric properties and dielectric strength were investigated. It was observed that the dynamic characteristics of crystalline α
c
-relaxation peak remain almost constant for the composites studied; while the activation energy plots almost coincide indicating that the time scale of this relaxation process is independent of the Fe
3
O
4
filler loading. Ferrite particles alter Maxwell-Wagner-Sillars (MWS) mechanism behaviour. In the isochronal diagrams of electric modulus dielectric function, at the lower ferrite concentration 5 wt% and the lowest frequency 0.1 Hz, two contributions to MWS process were clearly detected. For ferrite concentrations higher than 5 wt%, it seems that the contribution of amorphous-crystalline interfaces to the MWS relaxation drastically decreases and their effect is the broadening of the MWS peak at higher temperatures, while the effect of Fe
3
O
4
-PVDF matrix interfaces dominate in the formation of MWS relaxation. Herein, the nanocomposites dielectric strength performance was investigated by means of switching impulse high voltage stressing and AC (50 Hz) high voltage; from the results the nanocomposites demonstrated high levels of dielectrics strength accompanied with stable performance.
AB -
Nanocomposites of poly (vinylidene fluoride), PVDF, and magnetite (Fe
3
O
4
) nanoparticles were prepared using the twin screw compounding method and the effect of filler concentration (5–15 wt%) on the thermal stability, dielectric properties and dielectric strength were investigated. It was observed that the dynamic characteristics of crystalline α
c
-relaxation peak remain almost constant for the composites studied; while the activation energy plots almost coincide indicating that the time scale of this relaxation process is independent of the Fe
3
O
4
filler loading. Ferrite particles alter Maxwell-Wagner-Sillars (MWS) mechanism behaviour. In the isochronal diagrams of electric modulus dielectric function, at the lower ferrite concentration 5 wt% and the lowest frequency 0.1 Hz, two contributions to MWS process were clearly detected. For ferrite concentrations higher than 5 wt%, it seems that the contribution of amorphous-crystalline interfaces to the MWS relaxation drastically decreases and their effect is the broadening of the MWS peak at higher temperatures, while the effect of Fe
3
O
4
-PVDF matrix interfaces dominate in the formation of MWS relaxation. Herein, the nanocomposites dielectric strength performance was investigated by means of switching impulse high voltage stressing and AC (50 Hz) high voltage; from the results the nanocomposites demonstrated high levels of dielectrics strength accompanied with stable performance.
KW - Dielectric properties
KW - Differential scanning calorimetry (DSC)
KW - Interfaces
KW - Polymers
KW - Thermogravimetric analysis (TGA)
UR - http://www.scopus.com/inward/record.url?scp=85061310176&partnerID=8YFLogxK
U2 - 10.1016/j.jpcs.2019.01.025
DO - 10.1016/j.jpcs.2019.01.025
M3 - Article
AN - SCOPUS:85061310176
SN - 0022-3697
VL - 129
SP - 378
EP - 386
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
ER -