Dielectric behaviour and conductivity of high-filled BaTiO3-PMMA composites and the facile route of emulsion polymerization in synthesizing the same

Enthalten in
Journal of materials chemistry 
Volume
1
Issue
18
Start Page
3129
End Page
3137
Citation
Journal of Materials Chemistry C 18 (1): 3129-3137 (2013)
Publisher DOI
10.1039/c3tc30204k
Scopus ID
2-s2.0-84879516792
Publisher
Royal Society of Chemistry
Poly(methyl methacrylate)-BaTiO3 composites were prepared by a combined process of free radical emulsion polymerization and hot pressing. Using a cationic surfactant, emulsion polymerization was proven to be an easy and fast method to synthesize core-shell hybrid particles. By subsequent hot pressing of powders with different amounts of polymers, composites with barium titanate filler contents up to 65 vol% with uniform microstructures could be achieved, as determined by thermogravimetric analysis and scanning electron microscopy. The dielectric properties were characterized for frequencies and temperatures ranging from 100 Hz to 1 MHz and -30 to 80 °C, respectively. Composites exhibited a significant increase in dielectric constant up to 85 with BaTiO3 content and low loss tangents of 0.06 at 1 kHz. Dc conductivity measurements reveal increasing leakage currents with BaTiO 3 contents, enhanced by cationic surfactant influences. © 2013 The Royal Society of Chemistry.
DDC Class
540: Chemie
Projekt(e)
SFB 986: Teilprojekt A6 - Herstellung und Charakterisierung hierarchischer, multi-funktionaler Keramik/Metall-Polymer Materialsysteme 
More Funding Information
Hamburg, Behörde für Wissenschaft und Forschung
Joachim Hertz Foundation of the Hamburg Initiative for Excellence in Research (LEXI)