A Thermodynamic Polymer Cross-Linking System Based on Radically Exchangeable Covalent Bonds

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  • Yuji Higaki
    Institute for Materials Chemistry and Engineering, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
  • Hideyuki Otsuka
    Institute for Materials Chemistry and Engineering, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
  • Atsushi Takahara
    Institute for Materials Chemistry and Engineering, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan

Bibliographic Information

Published
2006-02-28
DOI
  • 10.1021/ma052093g
Publisher
American Chemical Society (ACS)

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Description

A thermodynamic covalent cross-linking system utilizing alkoxyamine units as thermally reversible covalent bonds was demonstrated. By heating the poly(methacrylic ester)s containing alkoxyamine units on the side chain, the cross-linking reaction was achieved as a result of a radical exchange reaction of alkoxyamine moieties. Kinetic studies have revealed that the cross-linking behavior depends remarkably on concentration and reaches equilibrium at a given reaction time, and characteristic reaction behaviors for thermodynamic reactions have been observed. The de-cross-linking reaction was carried out by heating the cross-linked polymer in the presence of an excess amount of alkoxyamine. It was found that the cross-linked points thermally dissociate and that the reaction system is reversible under stoichiometric control.

Journal

  • Macromolecules

    Macromolecules 39 (6), 2121-2125, 2006-02-28

    American Chemical Society (ACS)

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