Multifunctional fiberglass-reinforced PMMA-BaTiO3 structural/dielectric composites

Eduard A. Stefanescu, Xiaoli Tan, Zhiqun Lin, Nicola Bowler, Michael R. Kessler

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Fiberglass-reinforced polymer composites were investigated for potential use as structural dielectrics in multifunctional capacitors that require simultaneous excellent mechanical properties and good energy storage characteristics. Composites were fabricated employing poly(methyl methacrylate), PMMA, as the structural matrix. While barium titanate (BaTiO3) nanopowder was added to the composites for its high room temperature dielectric constant, fiberglass was employed to confer high stiffness. A conductive polymer blend of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonate (PEDOT:PSS) was used to coat the BaTiO3 nanoparticles with the purpose of further elevating the dielectric constant of the resultant PMMA-composites. FTIR spectroscopy, TGA and SEM measurements were conducted to prove the successful coating of BaTiO3 nanoparticles with the PEDOT:PSS blend. TEM measurements revealed a good dispersion of coated nanoparticles throughout the PMMA matrix. The fiberglass-reinforced-PMMA composites containing neat and coated BaTiO3 were found to exhibit excellent stiffness. In addition, the use of PEDOT:PSS in conjunction with BaTiO3 was observed to improve the dielectric constant of the composites. Finally, the dielectric constant of the structural composites was found to vary only slightly with temperature.

Original languageEnglish
Pages (from-to)2016-2024
Number of pages9
JournalPolymer
Volume52
Issue number9
DOIs
StatePublished - 19 Apr 2011

Bibliographical note

Funding Information:
This work is supported by NASA (Cooperative Agreement No.NNX09AP70A). The authors thank C. Stefanescu of LSU for help with the FTIR measurements. Special thanks are extended to Dr. Olesya Zhupanska for her support and thoughtful discussion and to Hongyu Cui for her help with the tensile testing experiments.

Keywords

  • Dielectric
  • Multifunctional
  • Polymer composite

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