Research Information System
International Journal of Adhesion and Adhesives, vol.148, 2026 (SCI-Expanded, Scopus)
Despite the popularity of epoxy coatings based on Bisphenol A due to their superior mechanical properties, chemical resistance, favorable electrical characteristics, and low moisture absorption, they are deficient in terms of high brittleness, low impact resistance, and poor yellowing resistance. Bio-based epoxy resins have garnered increasing attention due to their economic and environmental advantages. The present study investigates the impact of substituting bisphenol A diglycidyl ether (DGEBA) with glycerol triglycidyl ether (GTGE) in varying proportions to develop bio-based, environmentally friendly epoxy coatings. The findings indicate that increasing the proportion of GTGE enhances the coatings' impact resistance, yellowing resistance, and scratch resistance. While substituting 25% of DGEBA with GTGE improved the bio-content and yellowing resistance, the overall coating characteristics remained largely unchanged. However, a complete substitution of DGEBA with GTGE significantly improved adhesiveness, impact resistance, and yellowing resistance, albeit at the cost of reducing hardness by approximately 50%. Furthermore, the contact angle of coatings with DGEBA (71.38°) was notably higher than those with a higher GTGE content (45.25°), indicating improved surface spreading with increased GTGE. These results demonstrate that increasing the GTGE content enhances surface smoothness and adhesiveness, offering potential advantages for environmentally friendly coating applications.