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Advances in Materials Research
  Volume 2, Number 2, June 2013, pages 99-109
DOI: http://dx.doi.org/10.12989/amr.2013.2.2.099
 


A new low dielectric constant barium titanate – poly (methyl methacrylate) nanocomposite films
Ravindra H. Upadhyay and Rajendra R. Deshmukh

 
Abstract
    In the present investigation, nanocomposite films with poly(methyl methacrylate) (PMMA) as a polymer matrix and barium titanate as a filler were prepared by solution casting method. Barium titanate nano particles were prepared using Ti(IV) triethanolaminato isopropoxide and hydrated barium hydroxide as precursors and tetra methyl ammonium hydroxide (TMAH) as a base. The nanocomposite films were characterized using XRD, FTIR, SEM and dielectric spectroscopy techniques. Dielectric measurements were performed in the frequency range 100 Hz-10 MHz. Dielectric constant of nanocomposites were found to depend on the frequency, the temperature and the filler fraction. Dissipation factors were also influenced by the frequency and the temperature but not much influenced by the filler fractions. The 10 wt% of BT-PMMA nanocomposite had the lowest dielectric constant of 3.58 and dielectric loss tangent of 0.024 at 1MHz and 25oC. The dielectric mixing model of Modified Lichtenecker showed the close fit to the experimental data.
 
Key Words
    BT-PMMA nanocomposite; XRD; SEM; FTIR; dielectric constant
 
Address
Ravindra H. Upadhyay and Rajendra R. Deshmukh : Department of Physics, Institute of Chemical Technology, Matunga, Mumbai-400019, India
 

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