Dielectric properties improvement of polymer composite prepared from poly(vinylidene difluoride) and barium-modified porous clay heterostructure

• Published in: Electronic materials letters 2013, 9(3), , pp.315-323
• Main Authors: Bunnak, Natthaphon, Laoratanakul, Pitak, Bhalla, Amar S., Manuspiya, Hathaikarn
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Clay (material); Compressed; Compressing; Condensed Matter Physics; Dielectric properties; Difluorides; Dispersions; Heterostructures; Materials Science; Nanotechnology; Nanotechnology and Microengineering; Optical and Electronic Materials; Polyvinylidene fluorides; 전자/정보통신공학
• ISSN: 1738-8090; 2093-6788
• DOI: 10.1007/s13391-012-2210-z

Significant improvements in dielectric properties of poly(vinylidene difluoride) (PVDF) can be achieved by adding small amounts of barium-modified porous clay heterostructure (Ba-PCH). In this article, composite films of PVDF with various amounts of Ba-PCH were fabricated by the compression method. SEM images indicated good dispersion of Ba-PCH in the PVDF matrix, as island-like particles caused improvement in the mechanical and thermal properties in the composite films. The films were highly heat resistant between 446°C and 452°C, depending on the amount of Ba-PCH added. The addition of Ba-PCH in the PVDF matrix reduced the non-polar phase, α -phase, of the PVDF, which resulted in the presence of a polar-phase, β -phase. There was a decrement of the non-polar phase of PVDF after adding small amounts of Ba-PCH, the dielectric constant (at 1 kHz) was dramatically increased from 6.0 of the neat compressed PVDF film to 34.1, 44.8, 47.1, and 56.0 of the compressed PVDF film with 3 wt. %, 5 wt. %, 7 wt. %, and 10 wt. % of Ba-PCH in the PVDF matrix, respectively.