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Polymer Chemistry 2018

Polymer Sciences

ISSN: 2471-9935

Page 56

March 26-28, 2018

Vienna, Austria

3

rd

Edition of International Conference and Exhibition on

Polymer Chemistry

P

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.

Biography

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

under irradiation

Céline Croutxé-Barghorn, David Perrot, Ahmad Ibrahim

and

Xavier Allonas

Laboratory of Photochemistry and Macromolecular Engineering, France

Céline Croutxé-Barghorn et al., Polym Sci, Volume 4

DOI: 10.4172/2471-9935-C1-008