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

Autor:	Urs Karl Fischer, Robert Liska, Beate Ganster, Norbert Moszner
Rok vydání:	2008
Předmět:	Materials science Aqueous solution Polymers and Plastics Absorption spectroscopy medicine.medical_treatment Organic Chemistry Photochemistry Photobleaching Inorganic Chemistry Materials Chemistry medicine Reactivity (chemistry) Adhesive Irradiation Photoinitiator Dental restoration
Zdroj:	Macromolecules. 41:2394-2400
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma702418q
Popis:	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.
Databáze:	OpenAIRE
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