5 research outputs found

    MatĂ©riaux photopolymĂšres avancĂ©s et systĂšmes de photo-amorçages pour l’impression 3D

    No full text
    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 jusqu’à de grandes machines pour la production industrielle. Ce projet, issu d’une 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 l’industrie. Cette chimie prĂ©sente un avantage trĂšs important notamment par une limitation des Ă©missions de gaz Ă  effet de serre et de l’ensemble 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 d’ondes d’irradiation visible, diode Ă©lectroluminescentes (LED), faible intensitĂ©, viscositĂ©, vitesse d’écriture..

    Advanced photopolymers materials and photoinitiating systems for 3D printings

    No full text
    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 jusqu’à de grandes machines pour la production industrielle. Ce projet, issu d’une 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 l’industrie. Cette chimie prĂ©sente un avantage trĂšs important notamment par une limitation des Ă©missions de gaz Ă  effet de serre et de l’ensemble 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 d’ondes d’irradiation visible, diode Ă©lectroluminescentes (LED), faible intensitĂ©, viscositĂ©, vitesse d’écriture...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

    No full text
    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

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    New photoinitiating systems based on boron-dipyrromethene dye (bodipy)/iodonium salt and optionally tris­(trimethylsilyl)­silane 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: −11 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
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