Final conversions of methacrylate groups in the MWCNT/methacrylate composites based on BisGMA/TEGDMA (50%/50% w/w) monomers and the photoinitiating systems working by the photo-oxidation or photo-reduction of the biphenyl derivatives, determined by real-time FT-IR.
Photo-oxidation mechanism | Photo-reduction mechanism | ||||||
---|---|---|---|---|---|---|---|
Biphenyl derivative | BisGMA/TEGDMA (50%/50% w/w) with iodonium salt (1% wt) | Biphenyl derivative | (BisGMA)/(TEGDMA) (50%/50% w/w) with EDB (1.5% wt) | ||||
Content of CNTs [wt%] | Conversion in [%] | Content of CNTs [wt%] | Conversion in [%] | ||||
@ 365a nm | @ 405b nm | @ 365a nm | @ 405b nm | ||||
BI-PH-O-CH3 | 0 | 46.7 | 41.0 | BI-PH-CN | 0 | 24.9 | 30.0 |
0.1 | 41.6 | 42.6 | 0.1 | 26.1 | 23.2 | ||
0.25 | 41.5 | 42.5 | 0.25 | 28.9 | 28.2 | ||
0.5 | 43.5 | 36.6 | 0.5 | 30.0 | 26.9 |
Real-time FT-IR source of light LED @ 365 nm ∼ 16.27 mW cm−2.
Real-time FT-IR source of light LED @ 405 nm ∼ 21.23 mW cm−2.