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Visco-elastic and dielectric relaxation behavior of multiwalled carbon-nanotube reinforced silicon elastomer nanocomposites

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Abstract

Visco-elastic and dielectric spectra of multiwalled carbon-nanotube reinforced silicon elastomer nanocomposites were used to study relaxation behavior. SEM photomicrographs shows well dispersion of MWCNT in elastomer matrix. In visco-elastic analysis primary relaxation was studied as a function of temperature (−100 to 100 °C) at frequency 1Hz and strain 1 %. The effect of MWCNT loadings on storage modulus, loss modulus, and loss tangent has been studied. The non-linearity in loss tangent, storage modulus and loss modulus was explained on the basis of MWCNT-elastomer interaction and the inter-aggregate attraction of MWCNT. The secondary β relaxation was studied using dielectric relaxation spectra in the frequency range of 0.1 Hz to 106 Hz. The effect of MWCNT loadings on the complex and real parts of impedance was distinctly visible which has been explained on the basis of interfacial polarization of fillers in a heterogeneous medium and relaxation dynamics of polymer chains in the vicinity of fillers. The dielectric formalism has been utilized to further investigate the conductivity and relaxation phenomenon. The ‘percolation limit’ of the MWCNT in the silicon elastomer was found to be in the range of 4 phr loading.

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Authors and Affiliations

  1. Department of Physics, National Institute of Technology, Raipur, 492010, India

    J. Saji & A. Khare

  2. Department of Physics, ITER, SOA University, Bhubaneswar, 751030, India

    R. N. P. Choudhary

  3. Department of Chemistry, National Institute of Technology, Raipur, 492010, India

    S. P. Mahapatra

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  1. J. Saji
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  2. A. Khare
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  3. R. N. P. Choudhary
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  4. S. P. Mahapatra
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Correspondence to S. P. Mahapatra.

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Saji, J., Khare, A., Choudhary, R.N.P. et al. Visco-elastic and dielectric relaxation behavior of multiwalled carbon-nanotube reinforced silicon elastomer nanocomposites. J Polym Res 21, 341 (2014). https://doi.org/10.1007/s10965-013-0341-z

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