Abstract
A trifunctional epoxy acrylate (Tri-EA) was synthesized via trifunctional epoxy and acrylic acid, the structure of the monomer was characterized by FTIR and 1H NMR. Photopolymerization kinetics of Tri-EA – under different conditions such as varying photoinitiator type and concentration and light intensity and different functional reactive diluents, i.e. trimethylol propanetriacrylate (TMPTA), tripropylene glycol diacrylate (TPGDA), and 2-Hydroxyethyl acrylate (HEA) – was studied by real-time infrared spectroscopy (RTIR). The cured films were characterized with thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and universal testing machine. The results showed that different functional reactive diluents had a significant effect on kinetics and properties of the cured Tri-EA systems. Compared with difunctional epoxy acrylate (di-EA), Tri-EA showed higher glass transition temperatures (T g), higher thermal stability, and better adhesive strength while the polymerization extent and rate was lower.
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