Effect of tacticity on the dielectric properties of polystyrene

Saki Hikosaka, Yoshimichi Ohki

    研究成果: Article

    14 引用 (Scopus)

    抄録

    Dielectric properties of polystyrene (PS) were investigated by measuring electrical conduction current and frequency spectra of complex permittivity at temperatures from 20 to 199 °C. To clarify the effects of tacticity, the properties were compared among two kinds of syndiotactic PS (SPS) with different crystallinity values and one atactic PS (APS). Experimental results indicate that the two SPS samples show a high melting point of about 250 °C. The conductivity is lowest in SPS with the low crystallinity in the whole temperature range from 20 to 199 °C, while APS had a breakdown at 140 °C. Moreover, the low-crystallinity SPS shows the smallest permittivity values and the smallest increase in dielectric loss factor toward low frequencies among the three samples. The high-crystallinity SPS has α crystals. Since the density of α crystals is lower than the amorphous region, the charge transport and polarization are easier in the high-crystallinity SPS than in the low-crystallinity SPS.

    元の言語English
    ページ(範囲)299-303
    ページ数5
    ジャーナルIEEJ Transactions on Electrical and Electronic Engineering
    6
    発行部数4
    DOI
    出版物ステータスPublished - 2011 7

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    Dielectric properties
    Polystyrenes
    Permittivity
    Crystals
    Dielectric losses
    Melting point
    Charge transfer
    Polarization
    Temperature

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    これを引用

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    title = "Effect of tacticity on the dielectric properties of polystyrene",
    abstract = "Dielectric properties of polystyrene (PS) were investigated by measuring electrical conduction current and frequency spectra of complex permittivity at temperatures from 20 to 199 °C. To clarify the effects of tacticity, the properties were compared among two kinds of syndiotactic PS (SPS) with different crystallinity values and one atactic PS (APS). Experimental results indicate that the two SPS samples show a high melting point of about 250 °C. The conductivity is lowest in SPS with the low crystallinity in the whole temperature range from 20 to 199 °C, while APS had a breakdown at 140 °C. Moreover, the low-crystallinity SPS shows the smallest permittivity values and the smallest increase in dielectric loss factor toward low frequencies among the three samples. The high-crystallinity SPS has α crystals. Since the density of α crystals is lower than the amorphous region, the charge transport and polarization are easier in the high-crystallinity SPS than in the low-crystallinity SPS.",
    keywords = "Complex permittivity, Conductivity, Crystallization, Syndiotactic polystyrene, Tacticity",
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    AU - Ohki, Yoshimichi

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    N2 - Dielectric properties of polystyrene (PS) were investigated by measuring electrical conduction current and frequency spectra of complex permittivity at temperatures from 20 to 199 °C. To clarify the effects of tacticity, the properties were compared among two kinds of syndiotactic PS (SPS) with different crystallinity values and one atactic PS (APS). Experimental results indicate that the two SPS samples show a high melting point of about 250 °C. The conductivity is lowest in SPS with the low crystallinity in the whole temperature range from 20 to 199 °C, while APS had a breakdown at 140 °C. Moreover, the low-crystallinity SPS shows the smallest permittivity values and the smallest increase in dielectric loss factor toward low frequencies among the three samples. The high-crystallinity SPS has α crystals. Since the density of α crystals is lower than the amorphous region, the charge transport and polarization are easier in the high-crystallinity SPS than in the low-crystallinity SPS.

    AB - Dielectric properties of polystyrene (PS) were investigated by measuring electrical conduction current and frequency spectra of complex permittivity at temperatures from 20 to 199 °C. To clarify the effects of tacticity, the properties were compared among two kinds of syndiotactic PS (SPS) with different crystallinity values and one atactic PS (APS). Experimental results indicate that the two SPS samples show a high melting point of about 250 °C. The conductivity is lowest in SPS with the low crystallinity in the whole temperature range from 20 to 199 °C, while APS had a breakdown at 140 °C. Moreover, the low-crystallinity SPS shows the smallest permittivity values and the smallest increase in dielectric loss factor toward low frequencies among the three samples. The high-crystallinity SPS has α crystals. Since the density of α crystals is lower than the amorphous region, the charge transport and polarization are easier in the high-crystallinity SPS than in the low-crystallinity SPS.

    KW - Complex permittivity

    KW - Conductivity

    KW - Crystallization

    KW - Syndiotactic polystyrene

    KW - Tacticity

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