New Photocleavable Structures. Diacylgermane-Based Photoinitiators for Visible Light Curing

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• 作者：Beate Ganster ; Urs Karl Fischer ; Norbert Moszner ; Robert Liska
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：April 8, 2008
• 年：2008
• 卷：41
• 期：7
• 页码：2394 - 2400
• 全文大小：168K
• 年卷期：v.41,no.7(April 8, 2008)
• ISSN：1520-5835

文摘

As bisacylphosphine oxides are highly efficient, cleavable photoinitiators for visible light curing, we were interested in preparing diacylgermane 2. The UV–vis absorption maximum of the n−π* transition was red-shifted up to 50 nm. Photo-DSC results of 2 showed similar reactivity to bisacylphosphine oxides under broadband irradiation experiments. Irradiation with a dental LED lamp gave significantly improved initiation behavior compared to bisacylphosphine oxides and camphorquinone, especially in aqueous acidic primer formulations. Application-oriented tests in dental adhesive or composite formulations showed sufficient storage stability, high photocuring activity, excellent photobleaching behavior, and mechanical properties of the materials.