Centre National De La Recherche Scientifique

Universite Claude Bernard – Lyon1

Ecole Normale Superieure De Lyon

Université Grenoble Alpes

Patrice Baldeck

Akos Banyasz

Caroline Arnoux

Cyrille Monnereau

Michel Bouriau

Kevin John Heggarty

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

A photopolymerizable composition comprises at least a polymerizable resin, a photosensitizer, an annihilator, and a photoinitiator. The photosensitizer is formulated to absorb an excitation light signal received in a first range of wavelengths. The annihilator is formulated to emit a light signal in a second range of wavelengths different from the first. During the absorption of light by the photosensitizer in the first range of wavelengths, the annihilator emits a light signal in the second range, a photon energy of the emitted light signal being greater than a photon energy of the light signal received by the photosensitizer. The annihilator is also formulated to implement an energy transfer mechanism to excite the photoinitiator for polymerization of the resin. The excited photoinitiator is formulated to generate at least one polymerizable initiator to cause the polymerization reaction. Related methods, such as three-dimensional printing methods, and materials are also disclosed.

Photopolymerisable composition, material obtained by polymerising such a composition and 3D printing method using such a composition

Growing community of inventors

Vizille, France

Patrice Baldeck