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1998 Fiscal Year Final Research Report Summary

Competition in Crystallization between Different Components and Formation of Concentric Double Spherulites in Block Copolymers

Research Project

Project/Area Number 09650991
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 高分子構造・物性(含繊維)
Research InstitutionNagaoka University of Technology

Principal Investigator

SHIOMI Tomoo  Nagaoka University of Technology, Department of Materials Science & Technology, Professor, 工学部, 教授 (10134967)

Project Period (FY) 1997 – 1998
KeywordsCrystallization / Spherulite / Concentric circles / Block copolymer / Poly (epsilon-caprolactone) / Poly (ethylene glycol) / Long spacing
Research Abstract

A unique morphology of spherulites, namely double spherulites like concentric circles, was observed for poly(epsilon-caprolactone)-block-poly(ethylene glycol)-block-poly(epsilon-caprolactone) (PCL-PEG-PCL) triblock copolymers, ABA-2 and ABA-3, with PCL compositions of 66 and 60 wt%, respectively. The inside and outside spherulites in the concentric spherulites were those of PCL and PEG, respectively. In formation of the conceniric spherulites, the spherulites of the PCL component first occurred necessarily and grew, and then the PEG spherulite developed from the growth front of the PCL spherulite. Any nucleation of the PEG spherulite prior to that of PCL was not observed. In the triblock copolymers, ABA-1 and ABA-4, with PCL compositions of 83 and 34 wt%, respectively, no concentric spherulites were observed but a usual single spherulite was formed ; in ABA-1 only PCL spherulites was formed while only PEG spherulite was observed in ABA-4. Two melting peaks appeared for ABA-2 and ABA-3 in which the concentric spherulites was observed. The SAXS curves also had two kinds of peaks due to alternating structure of the crystal lamella and amorphous layer for both ABA-2 and ABA-3. The long spacing estimated from the peak position suggested that the amorphous chains of the counter component existed between the crystal lamella.

  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 塩見 友雄: "ブロック共重合体の結晶化挙動" 高分子. 47. 140-140 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 塩見 友雄: "多相高分子の結晶化の特性" 日本ゴム協会誌. 71. 209-216 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 塩見 友雄: "高分子多相系の結晶化" 繊維学会誌(繊維と工業). 55. P-87-P-91 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shiomi: "Crystallization of Block Copolymers" High Polymers, Japan. 47. 140 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shiomi: "Crystallization Behavior and Structure Formation of Crystalline Multiphase Polymers" Journal of The Society of Rubber Industry, Japna. 71. 209 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shiomi, K.Imai, T.Onishi, K.Takenaka, Y.Tezuka, H.Hayashi: "Appearance of Concentric Double Spherulites for ABA-Type Triblock Copolymers Having Only Crystalline Components" Report of The Poval Committee. 112. 1 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shiomi, K.Imai, T.Onishi, K.Takenaka, Y.Tezuka, H.Hayashi: "Formation of Double Spherulites in Crystalline Block Copolymers" Proceedings of The Third China Japan Seminar on Advanced Engineering Plastics, Polymer Alloys and Composites. 166 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shiomi: "Crystallization in Multiphase Polymer Systems" Sen'i Gakkaishi. 55. P-87 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shiomi, K.Imai, K.Takenaka, H.Hayashi, Y.Tezuka: "Appearance of Double Spherulites like Concentric Circles for Poly (epsilon-caprolactone) -blocsk-Poly (ethyleneglycol) -block-Poly (epsilon-caprolactone)" Macromolecules. in press.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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