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Highly improved dielectric properties of polymer/α-FeO composites at elevated temperatures

RSC Advances, ISSN: 2046-2069, Vol: 6, Issue: 69, Page: 64871-64878
2016
  • 15
    Citations
  • 0
    Usage
  • 10
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    15
    • Citation Indexes
      15
  • Captures
    10

Article Description

α-FeO particles were incorporated into ten kinds of polymer matrices, and the dielectric properties of the resultant polymer/α-FeO composites were investigated between 40 °C and 160 °C. We found that the dielectric properties strongly depended not only on the temperatures but also on the kind of polymer matrices. For engineering plastics such as polyetherimide (PEI), the dielectric constant ϵ′ was highly enhanced at around 1 kHz by incorporation of the α-FeO particles owing to Maxwell-Wagner polarization of free electrons in the α-FeO particles. This is probably because the π electrons in the aromatic structures of the engineering plastics strongly interact with the electrons in the α-FeO particles. Furthermore, the dielectric loss factor ϵ′′ for the engineering plastics became small at elevated temperatures because the conductivity of the α-FeO particle was enhanced and therefore the relaxation frequency of Maxwell-Wagner polarization was shifted to higher frequency. PEI/α-FeO composites exhibited highly improved dielectric properties at around 1 kHz, the high ϵ′ and very low ϵ′′ at the elevated temperatures above 120 °C. It was demonstrated that the PEI/α-FeO composite was comparable to the PEI/BaTiO composite in dielectric performance at 160 °C. Because the cost of α-FeO is much lower than that of BaTiO, the PEI/α-FeO composite might be promising as a low-cost dielectric material for high-temperature applications.

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