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Formation Mechanism of Extended-Chain Crystal of Polyethylene

Research Project

Project/Area Number 63550027
Research Category

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

Allocation TypeSingle-year Grants
Research Field Applied materials
Research InstitutionFukuoka University

Principal Investigator

YASUNIWA Munehisa  Fukuoka Univ., Assistant Prof., 理学部, 助教授 (90044289)

Co-Investigator(Kenkyū-buntansha) TSUBAKIHAR Shinsuke  Fukuoka Univ., Assistant, 理学部, 助手 (70188613)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1989: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1988: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsPolyethylene / High Pressure / Thermal Analysis / Small Angle X-ray / Melting / Crystallization / Lamella / Single Crystal / 伸びきり鎖結晶 / 高圧相
Research Abstract

Following results were obtained in our research project "Formation Mechanism of Extended-Chain Crystal of Polyethylene"
1. A solution crystallized sample of ultra-high molecular weight polyethylene (PE) was made. Melting process of it under high pressure was studied by high pressure DTA, and a phase diagram of it was obtained from peak melting temperature of DTA curves.
In the high pressure region such as 600 MPa, thick lamellae similar to extended-chain crystal (ECC) are formed very rapidly in the heating process. The rapid lamellae thickening is suggested to be due to the decrease of entanglements.
2. A single-crystal mat sample of PE crystallized from dilute solution was made. The melting and crystallization processes were studied by high pressure DTA. Lamellar thickening and change of orientation of molecular chain in the melting process were studied by small and wide angle X-ray analysis.
(1) In the pressure region lower than 300 MPa, lamellar thickening proceeds up to the peak melting temperature in the DTA curve. Above it, melting of the crystal starts, therefore ECC does not form.
(2) In the pressure region higher than 300 MPa, the lamellar thickening proceeds even in the hexagonal phase, therefore very thick lamellae like as ECC is formed in the melting process.
(3) In the high pressure region, original orientation of the molecular chain does not change after the melt, then this persistence of the molecular orientation have an effect on the growth of ECC.

Report

(3 results)
  • 1990 Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Shinsuke Tsubakihara: "Melting and Crystallization of Polyethylene SingleーCrystal Mats under High Pressure" Reports on Progress in Polymer Physics in Japan. 31. 159-160 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Munehisa Yasuniwa: "Melting and Crystallization of Solution Crystallized UltrーHigh Molecular Weight Polyethylene under High Pressure" Polymer Journal. 22. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Shinsuke Tsubakihara: "High Pressure Phase of UltraーDrawing Polyethylene" Reports on Progress in Polymer Physics in Japan. 33. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Munehisa Yasuniwa: "Lamellar Thickening of Polyethylen under High Pressure" Polymer Journal.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Chitoshi Nakafuku: "Effects of Mixing Tetracontane on the Melting and Crystallization of Polyethylen under High Pressure" Polymer Journal. 22. 110-117 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Chitoshi Nakafuku: "Melting and crystallization of ultraーhigh molecular weight polyethylene in the mixture with tetracontane under high pressure" Polymer. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S. Tsubakihara, M. Yamaguchi, and M. Yasuniwa: "Melting and Crystallization of Polyethylene Single-Crystal Mats under High Pressure" Rept. Progr. Polym. Phys. Jpn.31. 159-160 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Yasuniwa, M. Yamaguchi, A. Nakamura, and S. Tsubakihara: Polymer Journal. 22. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S. Tsubakihara, A. Nakamura, and M. Yasuniwa: "High Pressure Phase of Ultra-Drawing Polyethylene" Rept. Progr. Polym. Phys. Jpn.33. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] C. Nakafuku, M. Yasuniwa, and S. Tsubakihara: "Effects of Mixing Tetracontane on the Melting and Crystallization of Polyethylene under High Pressure" Polymer Journal. 22. 110-117 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] C. Nakafuku, H. Nakagawa, M. Yasuniwa, and S. Tsubakihara: "Melting and crystallization of ultra-high molecular weight polyethylene in the mixture with tetracontane under high pressure" Polymer.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Yasuniwa, M. Yamaguchi, and S. Tsubakihara: "Lamellar Thickening of Polyethylene under High Pressure" Polymer Journal.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Munehisa Yasuniwa: "Melting and Crystallization of Solution Crystallized UltraーHigh Molecular Weight Polyethylene under High Pressure" Polymer Journal. 22. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Munehisa Yasuniwa: "Lamellar Thickening of Polyethylene under High Pressure" Polymer Journal.

    • Related Report
      1989 Annual Research Report
  • [Publications] Chitoshi Nakafuku: "Effects of Mixing Tetracontane on the Melting and Chystallization of Polyethylene under High Pressure" Polymer Journal. 22. 110-117 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Chitoshi Nakafuku: "Melting and crystallization of ultraーhigh molecular weight polyethylene in the mixture with tetracontane under high pressure" Polymer. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Shinsuke Tsubakihara: "High Pressure Phase of UltraーDrawing Polyethylene" Reports on progress in Polymer Physics in Japan. 33. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Munehisa Yasuniwa: Polymer Journal. 20. 1075-1082 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Shinsuke Tsubakihara: Reports on Progress in Polymer Physics in Japan. 31. 159-160 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2023-01-13  

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