Silicone–barium titanate composites with increased electromechanical sensitivity. The effects of the filler morphology

Bele, Adrian; Cazacu, Maria; Stiubianu, George; Vlad, Stelian

doi:10.1039/c4ra09903f

Cited by 43 publications

(45 citation statements)

References 41 publications

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“…was prepared and purified in house by a procedure adapted from the literature [22] and described in ref. [23]. Stress-strain measurements were performed on a TIRA test 2161 apparatus, Maschinenbau…”

Section: Methodsmentioning

confidence: 99%

Dielectric elastomers based on silicones filled with transitional metal complexes

Ştiubianu¹,

Soroceanu²,

Varganici³

et al. 2016

Composites Part B: Engineering

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Please cite this article as: Ştiubianu G, Soroceanu A, Varganici C-D, Tugui C, Cazacu M, Dielectric elastomers based on silicones filled with transitional metal complexes, Composites Part B (2016), Abstract New composite dielectric elastomers with improved dielectric properties were prepared on the basis of polydimethylsiloxane rubber filled with new types of metal (Mn, Fe, Cr) complexes of the bisazomethine derived from the condensation of a siloxane diamine, 1,3-bis(aminopropyl)tetramethyldisiloxane, with 3,5-di-bromo-2-hydroxybenzaldehyde. The tetramethyldisiloxane fragment from the structure of the complexes creates the premise for a good compatibility with the silicone matrix without the need for other surface treatments while the complexed metal unit through its polar character changes the dielectric properties of the material. The resulted composites crosslinked at room temperature as dielectric elastomer films were investigated in order to establish if such materials are suitable for use in the structure of electromechanical devices.The introduction of metal complexes in the polymer matrix has led to a slight decrease of the elastic domain but increased the relative dielectric permittivity with up to 100% and the electromechanical sensitivity of the materials, with negligeable changes of the thermal behavior and overall moisture sorption capacity, thus preserving the chemical stability and hydrophobic character of siloxanes.

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Section: Methodsmentioning

confidence: 99%

Dielectric elastomers based on silicones filled with transitional metal complexes

Ştiubianu¹,

Soroceanu²,

Varganici³

et al. 2016

Composites Part B: Engineering

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show abstract

“…Such superior combination of functional properties ranked them as "intelligent materials" for the development of sensors [7,8], microelectronic devices [9,10] and photocatlytic cells [11]. Cadmium titanate (CdTiO 3 ), a member of this well-known family, owns a wide range of the above-mentioned properties and has been extensively described in literature in crystal, thin film and powder formats.…”

Section: Introductionmentioning

confidence: 99%

Dye sensitized solar cell applications of CdTiO3–TiO2 composite thin films deposited from single molecular complex

Ehsan

Khaledi

Pandikumar

et al. 2015

Journal of Solid State Chemistry

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“…Continuing our efforts to obtain silicone elastomers with optimized electromechanical properties [11,[25][26][27][28], in this paper, we addressed the working strategy consisting in the original combination of two active fillers with complementary effects: silica, as a reinforcing filler and barium titanate, both from commercial sources, to increase the dielectric permittivity of the composites obtained. In addition, the uniqueness of our approach consists in the use of a matrix of a polydimethylsiloxane of high molecular weight (M w = 642000 g mol -1 ) and its curing by a radical mechanism, which takes place at high temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the uniqueness of our approach consists in the use of a matrix of a polydimethylsiloxane of high molecular weight (M w = 642000 g mol -1 ) and its curing by a radical mechanism, which takes place at high temperature and pressure. The crosslinking pattern is different from that used in the majority of cases reported in the literature to stabilize the dielectric silicone elastomers for which, in general, commercial silicone kits with vulcanization by condensation of the chain ends with a tri-or tetrafunctional crosslinking agent are used [5,25,29,30]. The system reported here rather resembles the curing by hydrosilylation, but it is applicable only in case of relatively low molecular weight polysiloxanes, with more flexibility to ensure access to each other functional groups (Si-H and Si-CH=CH 2 ) [27,31,32].…”

Section: Introductionmentioning

confidence: 99%

Silicone dielectric elastomers based on radical crosslinked high molecular weight polydimethylsiloxane co-filled with silica and barium titanate

Bele¹,

Stiubianu²,

Varganici³

et al. 2015

J Mater Sci

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A strategy, consisting in the use in tandem of two active fillers in different ratios with complementary effects: silica mainly as a reinforcing agent and barium titanate as dielectric permittivity enhancer, was proposed to optimize the electromechanical properties of the silicone elastomers. A high molecular mass polydimethylsiloxane-a,x-diol (M w = 642000 g mol -1 ) was used as a matrix to prepare silicone composites which further were processed as films and crosslinked at high temperature. The morphological, thermal, and moisture behaviors of the films were studied by adequate techniques. The mechanical properties were estimated on the basis of normal and cyclic stress-strain curves. Dielectric spectra were recorded in the frequency range of 1-10 6 Hz at normal temperature. The voltages generated by a mechanical impulses created by falling of a metal ball of 7.1 g from a height of one hundred millimeters on the surface of the films placed between two electrodes ranged between 28.4 and 157.3 V mm -1 .

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Silicone–barium titanate composites with increased electromechanical sensitivity. The effects of the filler morphology

Abstract: Dielectric elastomers were prepared on the basis of high molecular weight polydimethylsiloxane-α,ω-diol filled with barium titanate particles having well-defined size and morphology.

Cited by 43 publications

References 41 publications

Dielectric elastomers based on silicones filled with transitional metal complexes

Dielectric elastomers based on silicones filled with transitional metal complexes

Dye sensitized solar cell applications of CdTiO3–TiO2 composite thin films deposited from single molecular complex

Silicone dielectric elastomers based on radical crosslinked high molecular weight polydimethylsiloxane co-filled with silica and barium titanate

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