期刊
MACROMOLECULAR MATERIALS AND ENGINEERING
卷 294, 期 12, 页码 877-886出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.200900181
关键词
composites; dental polymers; initiators; mechanical properties; photopolymerization
New dibenzoylgermanium derivatives are synthesized starting from various dithioacetal protected benzaldehydes by a coupling reaction with different dialkyldichlorogermanes and subsequent oxidative cleavage of the protecting group. The synthesized germanium compounds show a significantly stronger blue light absorption than camphorquinone. During irradiation, the dibenzoylgermanium derivatives undergo photodecomposition under formation of radicals. Therefore, the different dibenzoylgermanium derivatives are used as amine-free visible-light photoinitiators for dental cements and composites. Composites based on the different dibenzoylgermanes are storage-stable and show a significantly improved bleaching behavior over composites with CO/amine photoinitiators.
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