Photodegradation of Networked Polymers Composed of Photolabile Crosslinkers

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  • Kanji Suyama
    Faculty of Liberal Arts and Sciences, Osaka Prefecture University
  • Hideki Tachi
    Research Division of Polymer Functional Materials, Izumi Center, Osaka Research Institute of Industrial Science and Technology

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  • 光分解性架橋剤からなる架橋樹脂の光分解
  • ヒカリ ブンカイセイ カキョウザイ カラ ナル カキョウ ジュシ ノ ヒカリ ブンカイ

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Abstract

<p>Photolabile crosslinkers are compounds composed of photolabile units and polymerizing units. As well as conventional crosslinkers, photolabile crosslinkers can be introduced easily and homogeneously into networked polymers. In recent studies, o-nitrobenzylcarbonyl, coumarinmethyl, tertiary ester, and ruthenium complex units are incorporated as the photolabile units and are polymerized with hydrophilic monomers mainly in free-radical, ene－thiol, and click polymerization modes. Resulting hydrogels are used in the fields of medical applications mainly. Oxime-ester based photolabile crosslinkers are also proposed and incorporated in networked polyacrylates and polyurethanes. Their formation and degradation were successfully demonstrated, and photorheometers were useful tools for the evaluation of the formation and degradation behaviors on irradiation.</p>

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