Measurements of Permittivity and Conductivity of Adsorbed Polymer by Membrane Using 4 Terminals Method.

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  • Tsumagari Yosinari
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology
  • Tanioka Akihiko
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology

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Other Title
  • ４電極法による膜に吸着した高分子物質の誘電率と導電率の測定
  • 4 デンキョクホウ ニヨル マク ニ キュウチャクシタ コウブンシ ブッシツ

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In order to solve the problems in fouling and antithrombus, it is important to measure the permittivity and the conductivity of polymers adsorbed on hydrophobic and hydrophilic membranes. However, it has not been able to make acculate measurement of the capacitance of membranes adsorbing polymers at low frequency, because of the electrode polarization. We, thus, have utilized the 4 terminals method where the voltage and the electric current were mesured by using different elecrodes, to minimize the effect of electrode polarization. Using the above method, we measured the dielectric relaxation of Polycarbonate (PC) and Poly (tetrafluoroetylene) (PTFE) membranes adsorbing Poly (vinylpyrrolidone). In case of the PC membranes, the dielectric relaxation was not observed. On the other hand in case of the PTFE membranes, the relaxation was observed only when the amount of Polyvinylpyrrolidone was small. The permittivity of membrane was independent of the amount of adsorbed polymer, on the other hand, the conductivity of the membrane increased with increasing the adsorbed polymer, indicating that the hydrophobic membranes turned to hydrophylic.

Journal

  • MEMBRANE

    MEMBRANE 20 (6), 430-437, 1995

    THE MEMBRANE SOCIETY OF JAPAN

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