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A comparative study of scratch behavior of single‐ and bi‐layer hard coatings deposited on poly(methyl methacrylate) substrates was investigated. Trimethylolpropane triacrylate (TMPTA) and pentaerythriol triacrylate (PETA) with different chemical structure were chosen as a top layer for bilayer coatings, and soft base layer was introduced with varying thickness from 5 to 15 µm to demonstrate effect of soft base layer thickness on scratch properties. The scratch properties were characterized by a progressive load scratch test in terms of the onset of critical normal load for coating failure (i.e., crack and delamination). The introduction of soft base layer caused increase of critical normal load for the onset of coating failures, which implied the excellent scratch properties in both TMPTA and PETA systems. Moreover, it was found that thicker soft base layer led to better scratch properties. POLYM. ENG. SCI., 56:528–535, 2016. © 2016 Society of Plastics Engineers

Mar and abrasion resistance were investigated by a progressive load scratch test and steel wool abrasion test, respectively. Two acrylic coating systems including trimethylolpropane triacrylate (TMPTA) and pentaerythritol triacrylate (PETA) were prepared. A soft base layer was introduced as an intermediate layer between two different types of top layer and poly (methyl methacrylate) (PMMA) substrate to demonstrate the effect of soft base layer on mar and abrasion resistance. Abrasion damage on the coating surface was found to be less severe, when the soft base layer was incorporated into the coating systems. The reduction in scratch coefficient of friction (SCOF) and surface roughness was also observed. The results suggested that mar and abrasion resistance was greatly influenced by the presence of soft base layer, although different top layers were used. Moreover, it was found that abrasion resistance was further improved as the thicker soft base layer was applied.