Preparation and Characterization of Tapered Block Copolymers.

DOI

Bibliographic Information

Other Title
  • テーパードブロック共重合体の合成とキャラクタリゼーション

Description

Tapered block copolymers of styrene and isoprene were prepared by anionic copolymerization of monomer mixtures using sec-BuLi as an initiator in benzene/THF (50/50) at 0°C. Analyses based on both gas chromatography and 1H NMR indicated that monomer composition gradually varied from one chain end to the other. Furthermore, the tapered block copolymers were ozonized so as to decompose 1, 4-microstructure in the polyisoprene sequences. The GPC analysis results of the decomposed products by ozonolysis confirmed that the products had tapered regions in the chains. Two tapered block copolymers with different chain lengths in the tapered region and one regular block copolymer were prepared. Their morphologies were investigated by transmission electron microscopy and small angle X-ray scattering. Microphase-separated structures of three copolymers were revealed to show almost the same alternating lamellar structure.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 59 (12), 800-806, 2002

    The Society of Polymer Science, Japan

Keywords

Details 詳細情報について

  • CRID
    1390282681499355008
  • NII Article ID
    130004035520
  • DOI
    10.1295/koron.59.800
  • ISSN
    18815685
    03862186
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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