5 research outputs found
MatĂ©riaux photopolymĂšres avancĂ©s et systĂšmes de photo-amorçages pour lâimpression 3D
Three-dimensional (3D) printing is an additive manufacturing technology that allows fabricationof 3D objects by adding successive layers of materials (e.g. photopolymers) on top of each other. In thelast few years, this promising technology has developed rapidly and has found numerous applications invarious fields (e.g. electrical components, dentistry, food industry, surgery and biomaterials implants).This project is a collaboration between an industrial partner and an academic laboratory aims to developnew photosensitive resins outside usual acrylate and epoxy systems for our study. With this approach, theproduction of new polymer products that can be designed in a short time and for a low price in industrial3D additive manufacturing will be presented. These photosensitive resins consist of bio-based polymers.Today, faced with the growing scarcity of non-renewable raw materials, the development of bio-basedproducts is a priority for the industry. This chemistry has a very important advantage in particular bylimiting greenhouse gas emissions and all environmental impacts (toxicity, waste). All the components ofthe resin (photoinitiators and monomers/oligomers) have been developed for a specification towards theuse of: visible light irradiation "light-emitting diode LED", low intensity, low viscosity and writing fastspeed.Le domaine de l'impression 3D est actuellement en plein essor et correspond mĂȘme pourcertains Ă une rĂ©volution industrielle. L'impression 3D peut aussi utiliser des imprimantes Ă des prix abordables pour un usage domestique jusquâĂ de grandes machines pour la production industrielle. Ce projet, issu dâune collaboration entre un partenaire industriel et un laboratoire acadĂ©mique vise Ă dĂ©velopper de nouvelles rĂ©sines photosensibles pour la fabrication, la production ou l'Ă©tude de nouveaux produits polymĂšres qui peuvent ĂȘtre conçus, prototypĂ©s et testĂ©s en un temps court et pour un prix rĂ©duit en impression 3D. Ces rĂ©sines photosensibles sont Ă base de produits biosourcĂ©s : ALKYDE. De nos jours face Ă la rarĂ©faction Ă venir des matiĂšres premiĂšres non renouvelables, le dĂ©veloppement des produits biosourcĂ©s est une prioritĂ© pour lâindustrie. Cette chimie prĂ©sente un avantage trĂšs important notamment par une limitation des Ă©missions de gaz Ă effet de serre et de lâensemble des impacts environnementaux (toxicitĂ©,dĂ©chets). Tous les composants de la rĂ©sine (systĂšmes amorceurs et monomĂšres/oligomĂšres) sont dĂ©veloppĂ©s spĂ©cifiquement pour un cahier des charges spĂ©cifique de cette application longueurs dâondes dâirradiation visible, diode Ă©lectroluminescentes (LED), faible intensitĂ©, viscositĂ©, vitesse dâĂ©criture..
Advanced photopolymers materials and photoinitiating systems for 3D printings
Le domaine de l'impression 3D est actuellement en plein essor et correspond mĂȘme pourcertains Ă une rĂ©volution industrielle. L'impression 3D peut aussi utiliser des imprimantes Ă des prix abordables pour un usage domestique jusquâĂ de grandes machines pour la production industrielle. Ce projet, issu dâune collaboration entre un partenaire industriel et un laboratoire acadĂ©mique vise Ă dĂ©velopper de nouvelles rĂ©sines photosensibles pour la fabrication, la production ou l'Ă©tude de nouveaux produits polymĂšres qui peuvent ĂȘtre conçus, prototypĂ©s et testĂ©s en un temps court et pour un prix rĂ©duit en impression 3D. Ces rĂ©sines photosensibles sont Ă base de produits biosourcĂ©s : ALKYDE. De nos jours face Ă la rarĂ©faction Ă venir des matiĂšres premiĂšres non renouvelables, le dĂ©veloppement des produits biosourcĂ©s est une prioritĂ© pour lâindustrie. Cette chimie prĂ©sente un avantage trĂšs important notamment par une limitation des Ă©missions de gaz Ă effet de serre et de lâensemble des impacts environnementaux (toxicitĂ©,dĂ©chets). Tous les composants de la rĂ©sine (systĂšmes amorceurs et monomĂšres/oligomĂšres) sont dĂ©veloppĂ©s spĂ©cifiquement pour un cahier des charges spĂ©cifique de cette application longueurs dâondes dâirradiation visible, diode Ă©lectroluminescentes (LED), faible intensitĂ©, viscositĂ©, vitesse dâĂ©criture...Three-dimensional (3D) printing is an additive manufacturing technology that allows fabricationof 3D objects by adding successive layers of materials (e.g. photopolymers) on top of each other. In thelast few years, this promising technology has developed rapidly and has found numerous applications invarious fields (e.g. electrical components, dentistry, food industry, surgery and biomaterials implants).This project is a collaboration between an industrial partner and an academic laboratory aims to developnew photosensitive resins outside usual acrylate and epoxy systems for our study. With this approach, theproduction of new polymer products that can be designed in a short time and for a low price in industrial3D additive manufacturing will be presented. These photosensitive resins consist of bio-based polymers.Today, faced with the growing scarcity of non-renewable raw materials, the development of bio-basedproducts is a priority for the industry. This chemistry has a very important advantage in particular bylimiting greenhouse gas emissions and all environmental impacts (toxicity, waste). All the components ofthe resin (photoinitiators and monomers/oligomers) have been developed for a specification towards theuse of: visible light irradiation "light-emitting diode LED", low intensity, low viscosity and writing fastspeed
The 1,3-bis(dicyanomethylidene)indane skeleton as a (photo) initiator in thermal ring opening polymerization at RT and radical or cationic photopolymerization
International audience1,3-Bis(dicyanomethylidene)indane is presented as a new initiator for ring opening polymerization of epoxides at RT. This compound behaves as a strong acid (AH) with an associated basic form (A ) that does not inhibit the propagation of the cationic polymerization. Remarkably, A is characterized by a strong visible light absorption and can also photosensitize iodonium salt decomposition. A new iodonium salt based on A as a counter-anion is proposed. This latter compound exhibits unusual properties: (i) excellent absorption in the 300-700 nm wavelength range and (ii) a free radical initiating ability for l > 300 nm. The chemical mechanisms are investigated by ESR, fluorescence and steady state photolysis experiment
Photopolymerization of Cationic Monomers and Acrylate/Divinylether Blends under Visible Light Using Pyrromethene Dyes
New photoinitiating systems based on boron-dipyrromethene
dye (bodipy)/iodonium
salt and optionally trisÂ(trimethylsilyl)Âsilane are proposed for the
polymerization of divinylether and epoxy monomers upon visible-light
exposure. The presence of the silane increases the epoxide rate of
polymerization and conversion. Using acrylate/vinyl ether blends,
the synthesis of cross-linked polymer networks (possessing two <i>T</i><sub>g</sub> values: â11 and 111 °C) is also
successfully achieved through concomitant cationic and radical polymerization
pathways. The chemical mechanisms associated with these initiating
systems are investigated by steady-state photolysis and ESR experiments