Polymer Based Nanodielectric Composites

Tan, Daniel Q.; Irwin, Patricia

doi:10.5772/23012

Cited by 28 publications

(27 citation statements)

References 10 publications

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“…3 ), and m  is the density of the matrix (density of PVDF matrix, m  = 1.78 g/cm 3 ). It is known in the literature that the composites prepared through the hot-pressing technique give the maximum possible density [17,[37][38][39][40].…”

Section: Density and Micro-structural Studiesmentioning

confidence: 99%

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Effect of nano- and micron-sized K0.5Na0.5NbO3 fillers on the dielectric and piezoelectric properties of PVDF composites

2016

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Polymer nanocrystal composites were fabricated by embedding polyvinylidene fluoride (PVDF) with K 0.5 Na 0.5 NbO 3 (KNN) nanocrystallites of different volume fraction using the hot-pressing technique. For comparison, PVDF-KNN microcrystal composites of the same compositions were also fabricated which facilitated the studies of the crystallite size (wide range) effect on the dielectric and piezoelectric properties. The structural, morphological, dielectric, and piezoelectric properties of these nano and micro crystal composites were investigated. The incorporation of KNN fillers in PVDF at both nanometer and micron scales above 10 vol% resulted in the formation of polar β-form of PVDF. The room temperature dielectric constant as high as 3273 at 100 Hz was obtained for the PVDF comprising 40 vol% KNN nanocrystallites due to dipole-dipole interactions (as the presence of β-PVDF is prominent), whereas it was only 236 for the PVDF containing the same amount (40 vol%) of micron-sized crystallites of KNN at the same frequency. Various theoretical models were employed to predict the dielectric constants of the PVDF-KNN nano and micro crystal composites. The PVDF comprising 70 vol% micron-sized crystallites of KNN exhibited a d 33 value of 35 pC/N, while the nanocrystal composites of PVDF-KNN did not exhibit any piezoelectric response perhaps due to the unrelieved internal stress within each grain, besides the fact that they have less domain walls.

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Section: Density and Micro-structural Studiesmentioning

confidence: 99%

“…Polymer-based composites are of technological importance especially for energy storage applications [1][2][3][4]. The most commonly used host polymer is polyvinylidene fluoride (PVDF), which is being studied in great detail [5][6][7][8][9][10] owing to its multifarious applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano- and micron-sized K0.5Na0.5NbO3 fillers on the dielectric and piezoelectric properties of PVDF composites

2016

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“…Extensive materials development efforts have led to several alternative dielectric polymers, including polycarbonate (PC), poly(ethylene terephthalate) (PET), and poly(phenylene sulfide) (PPS) with high operating temperatures (4125 1C). However, the dielectric constant of these polymers is still below 3.3 [21,23].…”

Section: Introductionmentioning

confidence: 97%

“…However, the strong dipolar coupling in these ferroelectric polymers causes high polarization hysteresis loss. Moreover, the operating temperature is still limited to below 125 1C due to low T m (o140 1C) [21,23].…”

Section: Introductionmentioning

confidence: 99%

Optimizing nanostructure to achieve high dielectric response with low loss in strongly dipolar polymers

et al. 2015

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Advances in modern electronics require the development of polymer-based dielectric materials with high dielectric constant, low dielectric loss, and high thermal stability. Fundamental dielectric theory suggests that strongly dipolar polymers have the potential to realize a high dielect Q3 ric constant. In order to achieve high thermal stability, these polymers should also possess a high glass transition temperature T g . However, it has been observed that in many dielectric polymers the dielectric constant decreases markedly at temperatures below T g due to dipole freezing. This study shows, through combined theoretical and experimental investigations, that nano-structure engineering of a weakly-coupled strongly-dipolar polymer can result in a high energy density polymer with low loss and high operating temperature. Our studies reveal that disorder creates a significantly larger free volume at temperatures far below T g , enabling easier reorientation of dipoles in response to an electric field in aromatic urea and thiourea polymers. The net result is a substantial enhancement in the dielectric constant while preserving low dielectric loss and very high breakdown field. These results here pave the way 1 3 5 7 Please cite this article as: Y. Thakur, et al., Optimizing nanostructure to achieve high dielectric response with low loss in strongly dipolar polymers, Nano Energy (2015), http://dx.doi.org/10.1016/j.nanoen.2015.06.021for engineering the nanostructure to create high energy density polymers with low loss and high operating temperature.

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“…Characterization of frequency and temperature dependent dielectric and electrical properties of the polymer nanocomposite (PNC) materials has been one of the intense areas of research in the advances of materials science and engineering . These PNC materials are broadly used as flexible nanodielectric substrate and an electrical insulator for the organic thin film transistors , transient electronic antennas , packaging for electronic devices , electromagnetic pollution and interference shielding , as a base matrix for the preparation of optoelectronic devices , sensors , and solid‐state energy storage and conversion devices .…”

Section: Introductionmentioning

confidence: 99%

Structural, morphological, thermal, dielectric, and electrical properties of alumina nanoparticles filled PVA–PVP blend matrix‐based polymer nanocomposites

Choudhary

2018

Polymer Composites

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Alumina (Al2O3) nanoparticles filled poly(vinyl alcohol) (PVA) and poly(vinyl pyrrolidone) (PVP) blend matrix (50/50 wt%) based polymer nanocomposite (PNC) films (i.e., [PVA–PVP]–x wt% Al2O3; x = 0, 1, 3, and 5) have been prepared by solution‐cast method. X‐ray diffraction study has confirmed that the structures of these PNC materials are predominantly amorphous. The formation of miscible blend, polymer–polymer and polymer–nanoparticle interactions, and the effect of Al2O3 nanoparticles on the thermal properties of PVA–PVP blend matrix have been examined by Fourier transform infrared, differential scanning calorimetry and scanning electron microscopy measurements of the PNC films. The dielectric and electrical spectra of these PNC films have been measured from 20 Hz to 1 MHz using dielectric relaxation spectroscopy. It has been found that the dispersion of merely 1 wt% Al2O3 nanoparticles in the PVA–PVP blend matrix significantly reduces the crystalline phase and enhance the melting phase transition temperature of the PNC material, while the dielectric permittivity greatly decrease due to nano confinement effect. The real parts of dielectric permittivity and the impedance of these PNC films decrease linearly with the increase of the frequency, whereas the ac electrical conductivity has increased. A nonlinear increase of dielectric permittivity has been found with an increase of the temperature of PNC film and its dc electrical conductivity obeys the Arrhenius behavior. The dielectric and electrical properties of these PNC materials confirm their suitability as flexible nanodielectric of frequency tunable permittivity. POLYM. COMPOS., 39:E1788–E1799, 2018. © 2018 Society of Plastics Engineers

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Polymer Based Nanodielectric Composites

Cited by 28 publications

References 10 publications

Effect of nano- and micron-sized K0.5Na0.5NbO3 fillers on the dielectric and piezoelectric properties of PVDF composites

Effect of nano- and micron-sized K0.5Na0.5NbO3 fillers on the dielectric and piezoelectric properties of PVDF composites

Optimizing nanostructure to achieve high dielectric response with low loss in strongly dipolar polymers

Structural, morphological, thermal, dielectric, and electrical properties of alumina nanoparticles filled PVA–PVP blend matrix‐based polymer nanocomposites

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