Centre National De La Recherche Scientifique

Universite Claude Bernard – Lyon1

Ecole Normale Superieure De Lyon

Cyrille Monnereau

Akos Banyasz

Patrice Baldeck

Caroline Arnoux

A polymerization initiator molecule, excitable by two photons and capable of generating polymerization-initiating free radicals, includes two branches grafted onto a central phenyl nucleus. Each branch includes an oligomer of oligophenyleneethynylenyl type or oligo-2,5-dihalogenphenyleneethynylenyl type. A photopolymerizable composition, activatable by two-photon absorption, includes a radically polymerizable resin and a photochemically effective amount of a radical photoinitiator system. The photoinitiator system includes at least one initiator molecule as described above. Moreover, a method and an associated device for two-photon three-dimensional printing are disclosed. The method includes transforming a volume of a photopolymerizable composition including at least one initiator molecule. The transformation includes irradiating the volume of composition with an irradiation light source emitting an irradiation signal having a wavelength Lof between 1 and 1.5 times, and preferably between 1.1 and 1.25 times, a cut-off wavelength Lof the initiator molecule. Embodiments may apply to submicron-resolution two-photon 3D printing.

Initiator molecule for a non linear absorption reaction, photopolymerisable composition that can be activated by biphotonic absorption and associated 3D printing method

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Maubec, France

Cyrille Monnereau