Fabrication and characterization of poly(methyl methacrylate)/CaCu sigma ub 3 theta i sigma ub 4 omicron sigma ub 12composites

Composites comprising Poly(Methyl Methacrylate) (PMMA) and CaCu sigma ub 3 theta i sigma ub 4 omicron sigma ub 12(CCTO) via melt mixing followed by hot pressing were fabricated. These were characterized using X-ray diffraction, thermo gravimetric, scanning electron microscopy, and Impedance analyzer...

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Bibliographic Details
Published in:Polymer engineering and science 2014-03, Vol.54 (3), p.551-551
Main Authors: Thomas, P, Ravindran, RS Ernest, Varma, KBR
Format: Article
Language:English
Subjects:
Analyzers
COMPOSITES
COPPER OXIDE
Dielectric properties
Dielectric relaxation
Dispersions
ELECTRICAL CONDUCTIVITY
ELECTRONIC PRODUCTS
Electronics
FABRICATION
Polarization
Polymethyl methacrylates
PROPERTIES
Symbols
THERMAL STABILITY
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Summary:Composites comprising Poly(Methyl Methacrylate) (PMMA) and CaCu sigma ub 3 theta i sigma ub 4 omicron sigma ub 12(CCTO) via melt mixing followed by hot pressing were fabricated. These were characterized using X-ray diffraction, thermo gravimetric, scanning electron microscopy, and Impedance analyzer for their structural, morphology, and dielectric properties. Composites were found to have better thermal stability than that of pure PMMA. The composite, with 38 Vol % of CCTO (in PMMA), exhibited remarkably low dielectric loss at high frequencies and the low frequency relaxation is attributed to the space charge polarization/MWS effect. Theoretical models were employed to rationalize the dielectric behavior of these composites. At higher temperatures, the relaxation peak shifts to higher frequencies, due to the merging of both ... and ... relaxations into a single dielectric dispersion peak. The AC conductivity in the high frequency region was attributed to the electronic polarization. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0032-3888