Polymer Chemistry 2018
March 26-28, 2018
Edition of International Conference and Exhibition on
hotochemical generation of free radicals and acids is
a widely used process in photopolymerization reactions.
Recently, photobase generators (PBG) systems have emerged as
new source of initiating species allowing the catalysis of different
reactions (thiol-Michael, thiol-isocyanate, thiol-epoxy…). The
versatility of PBGs will be highlighted through different examples.
The process of light-triggered polymerization of dopamine will be
first described. Irradiation of quaternary ammonium salts of
phenylglyoxylic acid used as photobase generators activates
the release of a strong base in water followed by an important
pH jump. This initiates the polymerization of dopamine, leading
to an on-demand formation of highly adhesive coating on steel.
Then, photopolymerization of a thiol/epoxy/isocyanate ternary
network was thoroughly investigated. Polymerization kinetics
demonstrated that the thiol- isocyanate reaction is completed
in a matter of seconds while the thiol-epoxy reaction exhibits a
catalytic character over a fewdays leading to a post-consolidation
of the coating. Moreover, the presence of the thiourethane
network enhances the thiol-epoxy properties by increasing the
physical cross-linking due to higher content of hydrogen
bonding. Compositional variations between thiol/epoxy and thiol/
isocyanate and the resulting final thermomechanical properties
and hardness offer many advantages in the development of
materials with tunable properties.
Céline Croutxé - Barghorn graduated in chemistry at the University of Bor-
deaux (France) and the Technische Hochschule of Darmstadt (Germany).
She attained her PhD in physical chemistry in 1996 at the University of
Haute Alsace (France). Her work focused on the use of photopolymers for
the generation of optical elements. She is currently Professor at University
of Haute Alsace and head of the research group “Photochemistry in Organic
and Hybrid Materials” (POHM) in the Department of Photochemistry. Her
present research interest is the study of the photopolymerization processes
in hybrid sol-gel glasses, nanocomposites and all organic resins and their
characterization for specific applications (coatings or bulk materials).[email protected]
Photobase generators: Polyvalent tools for polymerization
Céline Croutxé-Barghorn, David Perrot, Ahmad Ibrahim
Laboratory of Photochemistry and Macromolecular Engineering, France
Céline Croutxé-Barghorn et al., Polym Sci, Volume 4