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Cationically UV-cured functional coatings

Functionalized graphene sheets (FGS)/epoxy coatings cured by cationic photopolymerization were prepared and showed enhanced mechanical and electrical properties.
When Jun 14, 2013
from 03:00 PM to 05:00 PM
Where IMM (room 338, first floor) Area della Ricerca CNR-INAF - Via Gobetti 101, Bologna
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Today, multifunctionality in a coating formulation is essential since coatings do not only provide just a certain amount of protection towards the environment or optical appearance to a surface, but they should also provide additional functions like electrical conductivity, high chemical stability, high or low adhesive properties, and many others.
Functionalized graphene sheets (FGS)/epoxy coatings cured by cationic photopolymerization were prepared and showed enhanced mechanical and electrical properties. By analyzing the dielectric properties of the cured nanocomposites we found that graphene sheets shifted the insulating behavior of the pristine epoxy polymer to an almost conductive cured film, with thresholds limit of 10-6 S/cm reached [1]. This UV-curable formulations can find interesting applications, such as for conductive UV-curable inks.
Epoxy-polythiophene conductive films were prepared by simultaneouos photoinduced step-growth and cationic ring opening polymerization processes: while polythiophene was formed through electron transfer reaction between photochemically formed phenyliodinium radical cations followed by proton release and coupling reactions, UV-induced cationic ring opening polymerization of epoxy resin resulted in the formation of epoxy network. It was found that iodine doping provided a significant improvement in the surface conductivity.
Fluorescent sensors were prepared involving UV-photopolymerization of an epoxy formulation that includes bromomethyl reactive groups, and their post-functionalization modification through a click strategy. Quantitative click reaction within the bulk of the film allows obtaining films in which the fluorophore is uniformly and covalently linked throughout the epoxy network [2]. Depending on the chromophore bounded, the films are sensitive to different stimuli.
[1] M. Martin-Gallego, M. Hernandez, V. Lorenzo, R. Verdejo, M.A. Lopez-Manchado, M. Sangermano, Polymer 2012, 53, 1831-1838.
[2] S. Medel, P. Bosch, M. Sangermano, paper submitted.

Today, multifunctionality in a coating formulation is essential since coatings do not only provide just a certain amount of protection towards the environment or optical appearance to a surface, but they should also provide additional functions like electrical conductivity, high chemical stability, high or low adhesive properties, and many others.Functionalized graphene sheets (FGS)/epoxy coatings cured by cationic photopolymerization were prepared and showed enhanced mechanical and electrical properties. By analyzing the dielectric properties of the cured nanocomposites we found that graphene sheets shifted the insulating behavior of the pristine epoxy polymer to an almost conductive cured film, with thresholds limit of 10-6 S/cm reached [1]. This UV-curable formulations can find interesting applications, such as for conductive UV-curable inks.Epoxy-polythiophene conductive films were prepared by simultaneouos photoinduced step-growth and cationic ring opening polymerization processes: while polythiophene was formed through electron transfer reaction between photochemically formed phenyliodinium radical cations followed by proton release and coupling reactions, UV-induced cationic ring opening polymerization of epoxy resin resulted in the formation of epoxy network. It was found that iodine doping provided a significant improvement in the surface conductivity.Fluorescent sensors were prepared involving UV-photopolymerization of an epoxy formulation that includes bromomethyl reactive groups, and their post-functionalization modification through a click strategy. Quantitative click reaction within the bulk of the film allows obtaining films in which the fluorophore is uniformly and covalently linked throughout the epoxy network [2]. Depending on the chromophore bounded, the films are sensitive to different stimuli.
[1] M. Martin-Gallego, M. Hernandez, V. Lorenzo, R. Verdejo, M.A. Lopez-Manchado, M. Sangermano, Polymer 2012, 53, 1831-1838.[2] S. Medel, P. Bosch, M. Sangermano, paper submitted.