Multifunctional PMMA-Ceramic composites as structural dielectrics

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

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

We describe the influence of calcium copper titanate (CCTO), and montmorillonite (MMT) on the thermo-mechanical and dielectric properties of poly(methyl methacrylate) PMMA-based composites prepared by an in-situ, thermally activated, radical polymerization for multifunctional structural capacitor applications. MMT was used for its ability to disperse and suspend the CCTO particles through the generation of viscous monomer slurries. X-ray diffraction (XRD) measurements together with transmission electron microscopy (TEM) analysis revealed that the MMT platelets were present in both intercalated and exfoliated morphologies within the polymer matrix. The filler addition was found to improve the thermal stability and the glass transition temperature of PMMA in the composites. Furthermore, the elastic stiffness and dielectric constant of the resultant composites were observed to increase monotonically with filler loading. By contrast, the dielectric breakdown strength of the composite samples was found to diminish with increasing filler loading.

Original languageEnglish
Pages (from-to)5823-5832
Number of pages10
JournalPolymer
Volume51
Issue number24
DOIs
StatePublished - 12 Nov 2010

Bibliographical note

Funding Information:
This work is supported by NASA (Cooperative Agreement No. NNX09AP70A). The authors thank Malika Jeffries-EL and Jared Mike of ISU for help with the GPC measurements. Special thanks are extended to Dr. Olesya Zhupanska for her support and thoughtful discussion and to Wei Hu for his help with CCTO powder preparation.

Keywords

  • Ceramic
  • Nanocomposite
  • Polymer

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