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An investigation of the scratch formation in UV cured coatings by a combination of nanoscratch,
nanoindentation and optical microscopy provides a guide for an optimized design of such coatings when scratch resistance is desired. As a first and sensible guide, the choice of the proper formulation and the viscoelastic properties of the coating is essential. A thicker coating will also promote a good scratch resistance. For thin films, the appearance and morphology of scratches are strongly influenced by the substrate nature. A third aspect is observed when a primer is required in the design of the coating: even for hard topcoats, the scratch resistance can be significantly lowered by too soft a primer. Taking into account all these aspects, UVcurable starting formulations for wood, glass and polycarbonate are suggested.
