Influence of Preparation Conditions of Poly (ethylene glycol)/Poly (N-isopropylacrylamide) Block Copolymers on Their Properties

DOI
  • SHIMIZU Hidenobu
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology
  • YOKOHARA Tomomi
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology
  • WADA Risei
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology
  • OKABE Masaru
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology
  • WANG Li
    Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University

Bibliographic Information

Other Title
  • ポリ（Ｎ‐イソプロピルアクリルアミド）／ポリ（エチレングリコール）ジブロック共重合体の性質に及ぼす合成条件の影響

Abstract

Thermosensitive block copolymers of poly (N-isopropylacrylamide) (PNIPAM) and poly (ethylene glycol) (PEG) were synthesized by the redox reaction of the hydroxyl end group of PEG with a ceric ion. The effects of polymerization temperature and NIPAM concentration on the molecular weight of block copolymers were investigated. The molecular weight of the copolymer was found to increase in an exponential manner with an increase in NIPAM concentration when the polymerization was performed below the lower critical solution temperature (LCST) of PNIPAM. At a temperature above the LCST, on the other hand, few NIPAM monomers were polymerized regardless of NIPAM concentration, and the molecular weight of the block copolymers obtained was almost the same as that of the original PEG. These results indicate that above the LCST polymeric micelles are formed during polymerization and the polymerization hardly proceeds within the hydrophobic core of the polymeric micelles.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 61 (12), 640-642, 2004

    The Society of Polymer Science, Japan

Keywords

Details 詳細情報について

  • CRID
    1390001206521814912
  • NII Article ID
    130003837869
  • DOI
    10.1295/koron.61.640
  • ISSN
    18815685
    03862186
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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