French (Fr)English (United Kingdom)Japon
>>Dernières Actu

 PnP a été retenue pour participer au Projet Européen : AEROMUCO avec EADS 

 Dr K.ZAHOUILY est été nommé depuis 2011 Expert Européen à REA ( Research Executive Agency ) à Bruxelles. 

 PnP Participe au Projet Orail II ( pour l'insuline Orale) PnP est membre depuis 2009 D' Oseo Excellence " parmi les 2000 entrepreneurs qui vont de l'avant" 

 Dr K.ZAHOUILY a été a été promu par le Ministre de la défense EN 2010 " chevalier de l´Ordre national du Mérite" La médaille lui a été remise par le Professeur Jean-Marie LEHN Prix Nobel de Chimie.

>> Reportages
Emission Un projet, Une équipe diffusé sur la chaine M6.
UV Curing , Matériaux Photopolymères
société de chimie innovante...
The Photopolymerization PDF Print Email

The photopolymerization (by Prof C.DECKER)

A "green" technology and ultra-fast


Technology "UV-Curing" is based on the principle of photoinitiated polymerizations, namely the transformation of a liquid resin into an insoluble polymer material under the irradiation of a light source (in this case, the ultraviolet radiation).
The photochemical activation is one of the most effective methods to create reactive species and thereby initiate chemical reactions that can lead to the synthesis of new materials. It is in the field of polymers, this technology, combined with a very flexible operating costs relatively low, has experienced its largest industrial development. There is indeed a fast process, transforming almost instantaneously (in less than a second) a set of monomer molecules into a polymer material (three-dimensional network). Spatiotemporal selectivity of the method also allows to polymerize only lighted areas. Finally, clear advantage vis-à-vis the respect for the environment, technology is operated at room temperature, requires only low power consumption and no solvents, thus reducing the emission of pollutants. UV curing technology of paints and is 10 to 1 000 times faster than conventional thermal drying. Knowing that in 2010, coating processes must, under European Directive 1999/13 / EC of 57% reduce their emissions of solvents and volatile organic compounds (VOCs), most areas of the surface treatment, including manufacturers and paint applicators, will find themselves forced to replace their conventional thermal polymerization processes by solvent-free technologies.

 

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

Photopolymerization crosslinking is used in an increasing number of industrial applications due to outstanding performance of this synthesis method: a fast polymerization of a resin without solvent used selectively in illuminated areas. This technology has found its main markets in the graphic arts, microlithography and surface treatment materials for protective coatings. Photocurable resin comprises a monomer or an oligomer with multiple functions and a polymerizable photoinitiator which releases active species upon exposure to light (proton or acid free radicals). One of the points 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 to determine the fundamental kinetic parameters. Infrared spectroscopy time-resolved (g fro) [invented by Prof. C. Decker in 1988] is currently the only method to continuously record changes in the rate of conversion depending on the length of exposure in a time scale less than the second 2. The influence of chemical factors (photoinitiator, monomer, additives) and physical (light intensity, temperature) on the kinetics of polymerization has been studied for various types of monomers.

LAST_UPDATED2