Premium
Fabrication and characterization of poly(methyl methacrylate)/CaCu 3 Ti 4 O 12 composites
Author(s) -
Thomas P.,
Ravindran R.S. Ernest,
Varma K.B.R.
Publication year - 2014
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23586
Subject(s) - materials science , dielectric , composite material , dielectric loss , composite number , thermal stability , scanning electron microscope , methyl methacrylate , poly(methyl methacrylate) , dielectric spectroscopy , relaxation (psychology) , thermogravimetric analysis , polymer , monomer , chemical engineering , electrochemistry , psychology , social psychology , chemistry , optoelectronics , electrode , engineering
Composites comprising Poly(Methyl Methacrylate) (PMMA) and CaCu 3 Ti 4 O 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 β and α relaxations into a single dielectric dispersion peak. The AC conductivity in the high frequency region was attributed to the electronic polarization. POLYM. ENG. SCI., 54:551–558, 2014. © 2013 Society of Plastics Engineers