Fabrication of highly refractive, transparent BaTiO3/poly(methyl methacrylate) composite films with high permittivities

Daisuke Nagao, Takafumi Kinoshita, Akira Watanabe, Mikio Konno

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Incorporation of crystalline barium titanate (BT) nanoparticles into poly(methyl methacrylate) (PMMA) was carried out to prepare highly refractive polymer nanocomposite films that have transparency and high permittivities. The BT nanoparticles were prepared by hydrolysis of a barium/titanium complex alkoxide in 2-methoxyethanol, then surface-modified with a silane coupling agent (3-methacryloxypropyltrimethoxysilane) to improve their affinity for PMMA. The incorporation of the surface-modified nanoparticles into PMMA was performed up to a nanoparticle content almost equivalent to particle close-packing state. The refractive index of the composite films increased with nanoparticle incorporation, keeping the relative transmittance normalized with PMMA film above 90%. A high refractive index of 1.82 was reached at a nanoparticle content of 53 vol% with a dielectric constant as high as 36 and a dissipation factor as low as 0.05. The results demonstrate that the crystalline BT nanoparticles are useful fillers for effectively increasing both refractive index and dielectric constant of polymer nanocomposites.

Original languageEnglish
Pages (from-to)1180-1184
Number of pages5
JournalPolymer International
Issue number8
Publication statusPublished - 2011 Aug 1


  • Barium titanate
  • Nanocomposite
  • Permittivity
  • Refractive index
  • Transparency

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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