Abstract
Synthesis of three glycerol based hyperbranched epoxy resins (HBGEs) with varying amounts of glycerol is reported. The chemical structure is authenticated from FTIR, 1H NMR and 13C NMR studies with degree of branching from 0.70 to 0.88. The resins exhibit Newtonian flow behavior as indicated by a rheometric study. Time, temperature and amount of glycerol for the best cured epoxy thermosets (cured with poly(amidoamine)) are optimized by the multi-response surface methodology via a composite desirability function. The poly(amido amine) cured epoxy thermosets exhibit high gloss (84.5–90.7 at 60°), good impact resistance (>100cm), high scratch hardness (up to 10kg), good tensile strength (24.59–48.6Mpa), moderate elongation at break (16.6–28.1%), high strain energy or toughness (611, 590.29 and 483MPa) exceptionally high adhesive strength (1578MPa for aluminum) and good chemical resistance. Thus, the glycerol based hyperbranched epoxy resin possesses good toughness to be used as an advanced adhesive/binder for different advanced applications.
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