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Emission Un projet, Une équipe diffusé sur la chaine M6.
UV Curing , Matériaux Photopolymères
société de chimie innovante...
The photopolymerization PDF Print E-mail

The photopolymerization (by Prof. C. Decker)

Technology "green" and ultra-fast

 Technology "UV-Curing" is based on the principle of photoamorced polymerizations, the conversion of a liquid resin into an insoluble polymer material under the irradiation of a light source (in this case, the ultra-violet radiation). The photochemical activation is one of the most effective methods to create reactive species and thus initiate chemical reactions that can lead to the synthesis of new materials. It is in the field of polymer technology, combined with very flexible relatively low operating costs, that this technique has found its most important industrial development. There is indeed an ultrafast process, turning almost instantly (in less than a second) a set of monomer molecules into a polymer material (three-dimensional network). Finally, advantage in face of the respect for the environment, this technology operated at room temperature, only requires a low consumption of energy and uses no solvent, thereby reducing the emission of pollutants. Technology UV paint is 1 to 1 000 times faster than traditional thermal drying. Knowing that in 2010, the coating processes must, within the framework of the EU Directive 1999 / 13 / EC, 57% reduce their emissions of solvents and volatile organic compounds (VOCs). Most sectors of the surface treatment, including manufacturers of paint applicators will be forced to replace their thermal polymerization processes conventional solvent-free technologies.

  • JPhotons & Polymers
  • JPhotons & Polymers
  • JPhotons & Polymers
  • JPhotons & Polymers

The photopolymerization reaction is used in an increasing number of industrial applications because of the remarkable performance of the process synthesis: an ultrafast curing of a resin without solvent selectively involved in the making. This technology has found its main markets in the graphic arts, microlithography and surface treatment of materials with protective coatings. UV Curable resin is a monomer or an oligomer with multiple functions of a polymerizable and photo-which releases active species upon exposure to light (free radicals or acid proton). One common to all systems currently used photopolymerizable is the speed of the process that takes place in a split second under intense illumination. It is generally difficult to quantitatively follow these ultrafast reactions in order to determine the fundamental kinetic parameters. Infrared spectroscopy Time-resolved (RTIR) [invented by Prof. C. Decker in 1988] is currently the only method to record continuously the evolution of the conversion rate depending on the duration of exposure in a time scale less than two seconds. The influence of chemical factors (photo-, monomer, additives) and physical (light intensity, temperature) on the kinetics of polymerization has been studied for different types of monomers.