Naphthyl-based acylphosphine oxide photoinitiators with high effiency and low migration

A new paper reports on Naphthyl-based acylphosphine oxide photoinitiators (N1–N3) which were designed and synthesised. N1–N3 possess red-shifted absorption spectra with high absorption molar absorption coefficients.

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A series of new naphthyl-based acylphosphine oxides (N1–N3) have been designed and synthesised. The obtained compounds could be used in the photo-initiated free radical polymerisation (FRP). The performances of N1–N3 in the FRP of trimethylolpropane triacrylate (TMPTA) and their UV–vis spectra were evaluated and compared with 2,4,6-trimethyl(phenyl)diphenyl oxide (TPO, a commercial photoinitiator).

Higher molar absorption coefficients and wider absorption wavelength

Results showed that N1–N3 possessed higher molar absorption coefficients and wider absorption wavelength than TPO. Under the same reaction conditions, N3 exhibited the best double bond conversion (DC) of TMPTA in the tested photoinitiators. Moreover, the calculated migration of N1–N3 of the solidified samples was 1/7, 1/3 and 1/23 of TPO, indicating the lower migration properties. Possible reasons of the performance of N1∼N3 were proposed.

The study has been published in Progress in Organic Coatings Volume 142, May 2020.

Image source: Pixabay.

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