Study on Adhesion Properties of UV-Curable Epoxy Methacrylate Coatings Modified By Hyperbranched Polyamidoamine Acrylate

In this research, hyperbranched polyamidoamine with amine end groups was reacted with glycidyl methacrylate to produce a hyperbranched polymer ended in acrylate functional units. Chemical structure and molecular weight of produced molecule were proved by FTIR, 1H NMR, and GPC analyses. Different amounts of yielded acrylate structure was added to coatings based on epoxy methacrylate to monitor the effect of polymer on adhesion properties of UV-cured coatings. The results of DMTA analysis revealed that Tg of samples containing hyperbranched polymer was 8 °C lower than that of blank sample, indicating flexibility of obtained coatings. Eventually, adhesion test manifested improvement in adhesion of coatings containing acrylate coatings, so that sample contained 10 wt.% of this additive showed 37% increase in adhesion level.