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Urethane acrylate oligomers are being used in a growing extent in many different applications where UV technology takes place. In order to develop coatings with predefined properties, relationships between the physico-chemical characteristics and the "applióative" (or functional) properties of the photocured material are required. In this paper, several sets of experiments including tensile properties and microhardness characterizations are performed on urethane acrylate oligomers — based systems and correlated to the viscoelastic properties of the free film. Viscoelastic measurements are very useful since they provide information not only on the glass transition temperature (through the maximum of the mechanical relaxation), but also on the amplitude of the phenomenon and the network structure. This study enables us to recommend some of the urethane acrylate oligomers under study for specific applications and to suggest typical formulations leading to coatings with high performances.
