New bio-sourced hydrogen donors as high performance coinitiators and additives for CQ-based systems: Toward aromatic amine-free photoinitiating systems

Cubane Cu4I4(phosphine)4 complexes as new co-initiators for free radical photopolymerization: towards aromatic amine-free systems

“…It can then occur through either a hydrogen transfer reaction or an electron-proton transfer reaction. [18] Most of the aromatic amines used as co-initiators, such as EDB, are now considered as toxic. Therefore, the search of safer photoinitiating systems is currently an important challenge in the field.…”

“…Therefore, the search of safer photoinitiating systems is currently an important challenge in the field. [18] Photoactive metal complexes are currently subject of intensive research that is mainly driven by their appealing applications in the field of photocatalysis, [19] solar energy conversion, [20] and light emitting devices. [21][22][23][24][25] In particular, tetranuclear copper-halide derivatives consisting of a tetranuclear cubane-like {Cu4X4} motif, is a class of photoactive complexes with interesting optical properties.…”

Hydrogen donors to replace aromatic amine based photoinitiating systems

“…In a previous work, we have developed new bio‐sourced hydrogen donors which are very efficient amine‐free systems with CQ (high degree of conversion in mild irradiation conditions, i.e., blue light, under air). [ 7 ] The idea here is to continue the development of alternative co‐initiators to aromatic amines. The new hydrogen donors described here will have a hydrogen donating moiety and also a copolymerizable part to ensure low migration/leaching properties.…”

“…Remarkably, compounds HD1, HD2, HD3, and HD4 were prepared in one step from commercially available 3,4‐methylenedioxyphenethylamine hydrochloride, ( R )‐pantolactone, racemic α ‐amino‐ γ ‐butyrolactone hydrobromide, piperonylamine, and methacrylic anhydride (Scheme 3, for further details see Section 3). [ 7 ] The particularity of these new compounds is the association of two interesting moieties in one unique structure: a hydrogen donor moiety and the copolymerizable methacrylic moiety. First, compounds HD1‐HD4 have been in‐silico designed from their low C–H bond dissociation energy (BDE).…”

“…Compounds HD1, HD2, HD3 and HD4 are promising candidates for the development of new amine free systems and seems to be better than the two bio sourced hydrogen donors already described in the literature. [ 7 ] For the different investigated systems, the polymerization only starts upon light irradiation. Indeed, the samples are stable without light.…”