Dielectric behaviour and functionality of polymer matrix – ceramic BaTiO3 composites

Patsidis, Anastasios C.; Psarras, G. C.

doi:10.3144/expresspolymlett.2008.85

Cited by 125 publications

(88 citation statements)

References 26 publications

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“…The relation between electrical and mechanical properties of conductive polymer composites [8] has also been subject of recent research. Very recently electrical relaxation dynamics in polymer matrix-ceramic composites has been reported by Psarras et al [9,10]. The incorporation of filler in to a rubber for instance CSM, not only enhances the mechanical properties of the final product but also decreases the cost of the end product.…”

Section: Introductionmentioning

confidence: 94%

Physico-mechanical and electrical properties of conductive carbon black reinforced chlorosulfonated polyethylene vulcanizates

Nanda¹,

Tripathy²

2008

Express Polym. Lett.

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Abstract. The present work deals with the effect of conductive carbon black (Ensaco 350G) on the physico-mechanical and electrical properties of chlorosulfonated polyethylene (CSM) rubber vulcanizates. The physico-mechanical properties like tensile strength, tear strength, elongation at break, compression set, hardness and abrasion resistance have been studied before and after heat ageing. Up to 30 parts per hundred rubber (phr) filler loading both tensile and tear strength increases beyond which it shows a decreasing trend whereas modulus gradually increases with the filler loading. Incorporation of carbon black increases the hysteresis loss of filled vulcanizates compared to gum vulcanizates. Unlike gum vulcanizate, in filled vulcanizates the rate of relaxation shows increasing trend. The bound rubber content is found to increase with increase in filler loading. Dielectric relaxation spectra were used to study the relaxation behavior as a function of frequency (100 to 10 6 Hz) at room temperature. Variation in real and imaginary parts of electric modulus has been explained on the basis of interfacial polarization of fillers in the polymer medium. The percolation limit of the conductive black as studied by ac conductivity measurements has also been reported.

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Section: Introductionmentioning

confidence: 94%

Physico-mechanical and electrical properties of conductive carbon black reinforced chlorosulfonated polyethylene vulcanizates

Nanda¹,

Tripathy²

2008

Express Polym. Lett.

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“…The latter is influenced by the amount of the employed barium titanate, the temperature, the frequency of the field, and the quality of dispersion of the BaTiO 3 nano-particles. It is well known and documented [51][52][53] that at low frequencies and high temperatures permittivity attains high values because sufficient time and mobility is given to permanent and induced dipoles to be oriented parallel to the applied field. Moreover, increasing the filler content results in higher values of permittivity, since (!))…”

Section: Broadband Dielectric Spectroscopy (Bds) Characterizationmentioning

confidence: 99%

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

Asimakopoulos¹,

Psarras²,

Zoumpoulakis³

2014

Express Polym. Lett.

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Abstract. Nanocomposite materials based on two different types of polyester matrix (a commercial type and a laboratory produced one) with embedded barium titanate nano-particles were developed and characterized. Structural and morphological characteristics of the produced composite specimens were studied via X-ray diffraction, Fourier transformation infra red spectroscopy, and scanning electron microscopy. Thermal, mechanical and electrical performance was examined via differential scanning calorimetry, bending and shear strength tests, and broadband dielectric spectroscopy, respectively. Mechanical strength appears to reduce with the increase of filler content. Commercial polyester's composites exhibit brittle behaviour, while laboratory polyester's composites exhibit an elastomeric performance. Dielectric data reveal the presence of four relaxation processes, which are attributed to motion of small parts of the polymer chain (!-mode), re-arrangement of polar side groups ("-mode), glass to rubber transition of the polymer matrix (#-mode) and Interfacial Polarization between the systems' constituents. Finally, the energy storing efficiency of the systems was examined by calculating the density of energy. Vol.8, No.9 (2014) 692-707 Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2014.72 * Corresponding author, e-mail: G.C.Psarras@upatras.gr © BME-PT An outstanding position in the group of electroceramics is given to composite materials based on barium titanate. Barium titanate is a wide band gap semiconductive ferroelectric material with perovskite structure which has been of practical importance for over 60 years due to its specific electrical properties. Barium titanate's great significance is expressed in its applications, which include ceramic capacitors, PTCR thermistors (positive temperature coefficient resistors/thermistors or posistors), piezoelectric sensors, optoelectronic devices, transducers, actuators etc. [4][5][6][7][8][9][10]. Furthermore, it is being applied as a capacitive material in dynamic random access memories (DRAM) in integrated circuits. DRAM applications require both high dielectric constant and good insulating properties [10]. Semiconductor memories such as dynamic random access memories (DRAM's) and static random access memories (SRAM's) currently dominate the market. However, the disadvantage of these memories is that they are volatile, i.e. the stored information is lost when the power fails. The non-volatile memories available at this time include complementary metal oxide semiconductors (CMOS) with battery backup and electrically erasable read only memories (EEPROM's). These non-volatile memories are very expensive. The main advantages offered by ferroelectric random access memories (FRAM's) include non-volatility and radiation hardened compatibility with CMOS and GaAs circuitry, high speed (30ns cycle time for read/erase/rewrite) and high density (4 (µm) 2 /cell size) [11]. Up to now, the most important utility of BaTiO 3 / polymer composites is ...

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“…As pointed out in a recent review [33], modification of the surface of the ceramic fillers, through chemical grafting or the production of core-shell structures is key to improve filler dispersion, reduce porosity, thereby improving the mechanical, and electrical properties of the composites. Most of the existent studies focus on the dielectric [34][35][36][37][38][39][40][41][42][43] and electromechanical [4,7,13,15,17,25,44] properties of such composites and relatively few systematic studies on their thermal and mechanical behavior have been published so far. Furthermore the ceramic volume fractions considered are often much lower than those used in most applications [45], studies of highly filled composites mainly being limited to lead-based ferroelectric materials [46,47].…”

Section: Introductionmentioning

confidence: 99%

The effect of processing conditions on the morphology, thermomechanical, dielectric, and piezoelectric properties of P(VDF-TrFE)/BaTiO3 composites

et al. 2012

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In this study (0-3) P(VDF-TrFE)/BaTiO 3 composites containing up to 60 vol% of ceramic phase were prepared by solvent casting or compression molding. Their thermomechanical, dielectric, and piezoelectric properties were investigated, and discussed in the light of the properties of the basic components, the processing route and the resulting morphology. The crystalline structure of the P(VDF-TrFE) matrix was found to be highly dependent on the processing route, while the structure of BaTiO 3 was not affected by any of the processing steps. The mechanical properties of the solvent cast materials showed a maximum at 30 vol% BaTiO 3 , while they increased monotonically with BaTiO 3 content for compression molded materials. This difference was attributed to a higher amount of porosity and inhomogeneities in the solvent cast composites. Permittivity as high as 120 and piezoelectric coefficient d 33 up to 32 pC/N were obtained for compression molded composites, and the observed decrease in d 33 with aging time was attributed to the effect of mechanical stress release in the polymer matrix.

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Dielectric behaviour and functionality of polymer matrix – ceramic BaTiO3 composites

Cited by 125 publications

References 26 publications

Physico-mechanical and electrical properties of conductive carbon black reinforced chlorosulfonated polyethylene vulcanizates

Physico-mechanical and electrical properties of conductive carbon black reinforced chlorosulfonated polyethylene vulcanizates

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

The effect of processing conditions on the morphology, thermomechanical, dielectric, and piezoelectric properties of P(VDF-TrFE)/BaTiO3 composites

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