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Procuction of Polyacetylene from Polyethylene Induced by High Voltage Breakdown

Research Project

Project/Area Number 61470097
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 高分子物性
Research InstitutionHokkaido University

Principal Investigator

TABATA Masayoshi  Faculty of Engineering, Hokkaido University, 工学部, 助教授 (50091476)

Co-Investigator(Kenkyū-buntansha) YOKOTA Kazuaki  Faculty of Engineering, Hokkaido University, 工学部, 教授 (30001217)
SAKAI Yousuke  Faculty of Engineering, Hokkaido University, 工学部, 助教授 (20002199)
山口 和美  北海道大学, 工学部, 助手 (00133702)
相馬 純吉  北海道大学, 工学部, 教授 (00001115)
Project Period (FY) 1986 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsPolyacetylene / Polyenylradical / Soliton / Insulating-breakdown Alkyl radical / アルキルラジカル / ドーピング / ポリアセチレン・ポリエニルラジカル / ポリエチレン / ESR / 伝導度 / ヨウ素 / 絶縁破壊 ポリエニルラジカル / インパルス破壊 / チーグラー触媒 / ESR法
Research Abstract

It was demonstrated that a new polyacetylene can be produced by a high voltage breakdown (HVB) of polyethylene (PE)together with a formation of primary alkyl radical.
No unstable chemical species created by the breakdown of PE as insulator are reported in detail and characterized by means of ESR method up to date as far as we know. Therefore it is necessary to know what kind of unstable chemical species are produced during the breakdown and to study the mechanism of breakdown of PE from view point of not only basic science but also industrial application as typical insulating materials.
A special sample tube and electric circuit for the breakdown of PE powder were designed in our laboratory. Hence it was found that the primary alkyl radical (1),-CH_2CH CH_2-was produced by the HVB at 77K. And this radical was found to convert into a polyenyl radical(II),-CH_2-CH CH=CH_n by the heat treatment of the sample. The line width of the observed radical,II showed a typical motional narrowing, like that of polyacetylene synthesized by Zieglar catalyst. Therefore the polyenyl radical which showed a singlet ESR signal can be called soliton as well as -radical stabilized in the main-chain of the ordinary polyacetylene
The double bond produced by the breakdown was found to increase when the reaction was carried out at room temperature. And also it was found that the conductivity of the polyacetylene created in the PE showed an increase of 6-7 magnitudes by doping with iodine as electron acceptor.

Report

(4 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • 1986 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] 田畑昌祥: 高分子加工. 36. 418-428 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 田畑昌祥: NIKKEI NEW MATERIALS. 9. 82-88 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masayoshi TABATA,et al: Chem Phys Lett,. 153. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masayoshi TABATA,et al: Macromolecules. 22. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masayoshi TABATA: "Review; Recent Study of Polyethylene" Polymer Processing. 36. 418-428 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masayoshi TABATA: "Review; New Development of Polyacetylene as a Material of Molecular Electronic Device" Nikkei New Materials. 9. 82-88 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masayoshi TABATA: "An ESR Study of Polyacetylene Produced by High Voltage Breakdown of Polyethylene" Chem. Phys. Lett. 153 (1989). 131. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masayoshi TABATA: "Soliton in Polyacetylene produced by High Voltage Breakdown of Polyethylene" Macromolecules. 22. (19)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 田畑昌祥: 高分子加工. 36. 418-428 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] 田畑昌祥: NIKKEI NEW MATERIALS. 9. 82-88 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Masayoshi TABATA et al: Chem Phyo Lelt. 153. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Masayoshi TABATA et al: Macromole cules. 22. (1990)

    • Related Report
      1988 Annual Research Report
  • [Publications] 田畑昌祥: 和雑誌 高分子加工. 36. 418-424 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] M.Tabate et al: Chem.Phys.Letl. 130. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] M.Tabate et al: Report on Progress in Poiymer physics in JAPAN. 31. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] 田畑昌祥: 高分子加工. 36. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] M.Tabata et al: Chem.Phys.Letty. 129. (1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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