炭化チタン存在下での3‐ヘキシルチオフェンの重合とその複合導電体の導電率‐温度特性  [in Japanese] Polymerization of 3-Hexylthiophene in the Presence of Titanium Carbide and Conductivity-Temperature Characteristics of the Conductive Composite Product.  [in Japanese]

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Abstract

炭化チタン (TiC) 存在下で3-ヘキシルチオフェンをFeCl<SUB>3</SUB>を開始剤として重合することによって, ポリマー組成比の異なる導電性高分子-TiC複合導電体が得られた. 複合導電体の導電率はポリマー含有率が約30wt%付近から減少した. またその導電率-温度特性は, ポリマー含有率によって異なるが, パーコレーションしきい値付近の組成のものでは, すなわち37wt%のポリマー含有率のものでは, 0℃から30℃の間で4桁導電率が減少した. 導電率の急激な減少が開始する温度はガラス転移温度と一致していた. ポリ (3-ブルチルチオフェン) をポリマー成分とする複合体でも検討した結果, 35℃で導電率が減少し, ポリ (3-ヘキシルチオフェン) 同様そのガラス転移温度と密接に関連していた.

Poly (3-hexylthiophene) -titanium carbide composites (P3HT-TiC) were prepared by polymerization of 3-hexylthiophene in the presence of TiC treated with FeCl<SUB>3</SUB>. Their electrical conductivity decreased with polymer content and the percolation threshold was <I>ca</I>. 30wt%. The conductivity change of P3HT-TiC with 9 wt% of polymer content against temperature was similar to that of TiC, whereas that of the composites with polymer content above 67wt% was similar to that of P3HT. For samples of polymer content near the percolation threshold, the conductivity change against temperature was different from that for both TiC and P3HT: the conductivity rapidly decreased at a temperature above 0°C (what is called PTC characteristic). The temperature was identical with <I>T</I><SUB>g</SUB> of P3HT. For a comparison with P3HT, the composite containing poly (3-butylthiophene) (3PBT) was prepared; the conductivity decreased at <I>ca</I>. 35°C near <I>T</I><SUB>g</SUB> of P3BT.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 56(7), 440-444, 1999

    The Society of Polymer Science, Japan

Codes

  • NII Article ID (NAID)
    130003837655
  • Text Lang
    JPN
  • ISSN
    0386-2186
  • Data Source
    J-STAGE 
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