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TitleNucleation of the electroactive γ phase and enhancement of the optical transparency in low filler content poly(vinylidene)/clay nanocomposites
Author(s)Lopes, A. C.
Costa, Carlos M.
Tavares, C. J.
Neves, I. C.
Lanceros-Méndez, S.
KeywordsElectroactive polymers
Sensor and actuators
Functional graded materials
Iron oxide magnetic nanoparticles (IOMNP)
Electroactive properties
Multiferroic materials
Issue date2011
PublisherAmerican Chemical Society (ACS)
JournalThe Journal of Physical Chemistry C
Abstract(s)Poly(vinylidene fluoride), PVDF, based nanocomposites with different clays structures have been processed by solvent casting and melt crystallisation. Depending on the melting temperature of the polymer, the nanocomposite recrystalises in the electroactive  or non electroactive β-phase of the polymer. This fact is related to the thermal behaviour of the clay. For montmorillonite clay, the full crystallisation of the electroactiveγ-phase occurs for clay contents lower than 0.5 wt%, allowing the nanocomposites to maintain the mechanical properties of the polymer matrix. The electroactivity of the material has been proven by measuring the piezoelectric d33 response of the material. The obtained value of d33 is -7 pC/N, lower than in β-PVDF obtained by mechanical stretching, but still among the largest coefficients obtained for polymers. Further, the optical transmittance in the visible range is strongly enhanced with respect to the transmittance of the pure polymer. Finally, it is demonstrated that the nucleation of the β-phase can be also obtained in other clays, such as in kaolinite and laponite.
Publisher version
AccessOpen access
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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