Abstract
Tetrabenzoylgermane 1 and various substituted tetrabenzoylgermanes 2–7 were investigated as visible light (VL) photoinitiators (PIs) for dental dimethacrylate resins and dimethacrylate-based composites. The tetrabenzoylgermanes 1–7 show a very strong VL absorption between 400 and 450 nm. Substituents on the benzoyl chromophore strongly influence their properties such as melting point, solubility, absorption behavior, or PI reactivity. A good photobleaching behavior and a very high reactivity as VL PI was found in photo-differential scanning calorimeter experiments for selected tetrabenzoylgermanes. Composite pastes containing only ∼0.1 wt % of Ge-PI exhibited a sufficient photocuring due to the high PI-reactivity of the tetraacylgermanes. Among the investigated germane PIs, tetrakis(2-methylbenzoyl)germane 2 shows the best performance as VL PI for restorative composites and enables the composites to be photocured using an LED with an emission maximum of 500 nm
Original language | English |
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Article number | 46115 |
Journal | Journal of Applied Polymer Science |
Volume | 135 |
Issue number | 15 |
DOIs | |
Publication status | Published - 2018 |