Tetraacylgermanes as highly efficient photoinitiators for visible light cured dimethacrylate resins and dental composites | Zendy

Moszner Norbert | Zendy; Fischer Urs Karl | Zendy; Lamparth Iris | Zendy; Fässler Pascal | Zendy; Radebner Judith | Zendy; Eibel Anna | Zendy; Haas Michael | Zendy; Gescheidt Georg | Zendy; Stueger Harald | Zendy

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Tetraacylgermanes as highly efficient photoinitiators for visible light cured dimethacrylate resins and dental composites

Author(s) -

Moszner Norbert,

Fischer Urs Karl,

Lamparth Iris,

Fässler Pascal,

Radebner Judith,

Eibel Anna,

Haas Michael,

Gescheidt Georg,

Stueger Harald

Publication year - 2018

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.46115

Subject(s) - reactivity (psychology) , materials science , photopolymer , composite material , photoinitiator , differential scanning calorimetry , absorption (acoustics) , chromophore , photochromism , polymer chemistry , chemistry , photochemistry , polymer , monomer , nanotechnology , medicine , alternative medicine , physics , pathology , thermodynamics

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. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46115.

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