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. 2020 Aug 28;10(53):32162–32182. doi: 10.1039/d0ra04146g

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
a

Real-time FT-IR source of light LED @ 365 nm ∼ 16.27 mW cm−2.

b

Real-time FT-IR source of light LED @ 405 nm ∼ 21.23 mW cm−2.