Dielectric constant enhancement in a silicone elastomer filled with lead magnesium niobate–lead titanate

Gallone, Giuseppe; Carpi, Federico; Rossi, Danilo De; Levita, G.; Marchetti, A.

doi:10.1016/j.msec.2006.03.003

Cited by 246 publications

(245 citation statements)

References 41 publications

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“…So the electrical energy conversion to heat energy leads to the actuator strain non-linear increase. More interestingly, the actuated strain at 5 kV/mm obviously increases from 0.3% for pure PDMS to 2.59% for the composites with 60 phr of RGO@SiO 2 , an eightfold increase in the actuated strain, much higher than that of other previously reported DEs [13,[43][44][45][46][47], as summarized in Table 6. The improvement in the actuated strain at low electric fields is in favor of the application of DE in the biological and medical fields (such as synthesis of artificial skin), tactile displays, and braille displays, etc.…”

Section: Electromechanical Properties Of Go@sio 2 /Pdms Compositesmentioning

confidence: 57%

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Simultaneously improved actuated performance and mechanical strength of silicone elastomer by reduced graphene oxide encapsulated silicon dioxide

Ning

Wang

Zhang

et al. 2015

International Journal of Smart and Nano Materials

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Herein, graphene oxide (GO)-encapsulated silica (SiO 2 ) hybrids (GO@SiO 2 ) were prepared via electrostatic self-assembly of the 3-aminopropyltriethoxysilane (APS)-modified SiO 2 and GO. The as-prepared GO@SiO 2 was introduced into polydimethylsiloxane (PDMS) elastomer to simultaneously increase the dielectric constant (k) and mechanical properties of PDMS. Then, the in situ thermal reduction of GO@SiO 2 / PDMS composites was conducted at 180°C for 2 h to increase the interfacial polarizability of GO@SiO 2 . As a result, the values of k at 1000 Hz are largely improved from 3.2 for PDMS to 13.3 for the reduced GO@SiO 2 (RGO@SiO 2 )/PDMS elastomer. Meanwhile, the dielectric loss of the composites remains low (<0.2 at 1000 Hz). More importantly, the actuated strain at low electric field (5 kV/mm) obviously increases from 0.3% for pure PDMS to 2.59% for the composites with 60 phr of RGO@SiO 2 , an eightfold increase in the actuated strain. In addition, both the tensile strength and elastic modulus are obviously improved by adding 60 phr of RGO@SiO 2 , indicating a good reinforcing effect of RGO@SiO 2 on PDMS. Our goal is to develop a simple and effective way to improve the actuated performance and mechanical strength of the PDMS dielectric elastomer for its wider application.

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Section: Electromechanical Properties Of Go@sio 2 /Pdms Compositesmentioning

confidence: 57%

“…[44] 8.0 (8 kV/mm) 0.4 PDVB@PANI/PDMS [43] 16.0 (43 kV/mm) 0.01 Dipoles-PDMS [45] 1.4 (16 kV/mm) <1 TiO 2 -PDMS (plasticized) [46] 18.0 (37 kV/mm) <2.5 SR/BT [47] 57.0 (46 kV/mm) <3 (60 phr)GO@SiO 2 /PDMS in our study 3.9 (15 kV/mm) 3.3…”

Section: Disclosure Statementmentioning

confidence: 99%

Simultaneously improved actuated performance and mechanical strength of silicone elastomer by reduced graphene oxide encapsulated silicon dioxide

Ning

Wang

Zhang

et al. 2015

International Journal of Smart and Nano Materials

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“…35 His model covers inclusion volume fractions up to 0.5 and is therefore frequently used for describing composites with very high filler loadings. [12] The model may even be applied after the formation of agglomerates, provided the percolation threshold is not exceeded. The equation is usually given in the following form:…”

Section: Dielectric Spectroscopymentioning

confidence: 99%

“…There have been a number of publications in which the dielectric constant of PDMS was successfully enhanced through simply blending a PDMS prepolymer with high-permittivity fillers. This method, despite being the easiest and most intuitive, offers a broad range of possibilities due to an essentially unlimited selection of fillers, amongst which one can find magnesium niobate-lead titanate, [12] titanium dioxide, [13] graphite, [14] carbon nanotubes, [15] graphene, [16] conductive polymers, [17] etc. A more sophisticated method of increasing the permittivity has been presented by Madsen et al, who covalently linked high-dielectric constant dipolar molecules to the elastomer backbone via a novel type of chain extender.…”

Section: Introductionmentioning

confidence: 99%

Glycerol as high‐permittivity liquid filler in dielectric silicone elastomers

Mazurek

Gerhard

et al. 2016

J of Applied Polymer Sci

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A recently reported novel class of elastomers was tested with respect to its dielectric properties.The new elastomer material is based on a commercially available polydimethylsiloxane (PDMS) composition, which has been modified by embedding glycerol droplets into its matrix. The approach has two major advantages that make the material useful in a dielectric actuator. First, the glycerol droplets efficiently enhance the dielectric constant which can reach astonishingly high values in the composite. Second, the liquid filler also acts as a softener that effectively decreases the elastic modulus of the composite. In combination with very low cost and easy preparation, the two property enhancements lead to an extremely attractive dielectric elastomer material. Experimental permittivity data are compared to various theoretical models that predict relative-permittivity changes as a function of filler loading, and the applicability of the models is discussed.

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“…The availability of these inorganic fillers together with their high dielectric constant values (on the order of hundreds or even thousands) makes them very appealing to be used as high dielectric constant fillers for DEA applications. In fact, Szabo et al, 17 Gallone et al, 18 and more recently, Molberg, 19 have reported the enhancing effect of BT, PMN-PT and PZT ceramics, respectively, on the dielectric response of different elastomers. Nevertheless, in spite of the permittivity increment observed in all the cases, these authors did not establish real improvements in the electro-mechanical performances of the developed composites mainly due to the following reasons: (i) the increase in the dielectric permittivity was counterbalanced by an increase in the elastic modulus, (ii) the electrical breakdown strength was reduced considerably, which clearly limited the maximum performance and, finally, (iii) the dielectric loss dramatically increased with the filler content cancelling the electro-mechanical performance of the actuator.…”

Section: Introductionmentioning

confidence: 98%

Towards materials with enhanced electro-mechanical response: CaCu3Ti4O12–polydimethylsiloxane composites

et al. 2012

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We describe a straightforward production pathway of polymer matrix composites with increased dielectric constant for dielectric elastomer actuators (DEAs). Up to date, the approach of using composites made of high dielectric constant ceramics and insulating polymers has not evidenced any improvement in the performance of DEA devices, mainly as a consequence of the ferroelectric nature of the employed ceramics. We propose here an unexplored alternative to these traditional fillers, introducing calcium copper titanate (CCTO) CaCu 3 Ti 4 O 12 , which has a giant dielectric constant making it very suitable for capacitive applications. All CCTO-polydimethylsiloxane (PDMS) composites developed display an improved electro-mechanical performance. The largest actuation improvement was achieved for the composite with 5.1 vol% of CCTO, having an increment in the actuation strain of about 100% together with a reduction of 25% in the electric field compared to the raw PDMS matrix.

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Dielectric constant enhancement in a silicone elastomer filled with lead magnesium niobate–lead titanate

Cited by 246 publications

References 41 publications

Simultaneously improved actuated performance and mechanical strength of silicone elastomer by reduced graphene oxide encapsulated silicon dioxide

Simultaneously improved actuated performance and mechanical strength of silicone elastomer by reduced graphene oxide encapsulated silicon dioxide

Glycerol as high‐permittivity liquid filler in dielectric silicone elastomers

Towards materials with enhanced electro-mechanical response: CaCu3Ti4O12–polydimethylsiloxane composites

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