Epoxy networks based on solutions of silsesquioxanes functionalized with 3-glycidoxypropyl groups in diglycidylether of bisphenol A (DGEBA)

In previous publications we reported the synthesis and characterization of silsesquioxanes derived from the hydrolytic condensation of (3-glycidoxypro pyl) trimethoxysilane (GPMS) using diglycidylether of bisphenol A (DGEBA) a s a solvent [1,2]. The reaction product has aliphatic epoxy groups supplied by the silsesquioxane and aromatic epoxy groups supplied by the solvent. S olutions containing 0, 25 and 50% aliphatic epoxy groups, were cured with d ifferent hardeners: methyltetrahydrophthalic anhydride (MTHPA), ethylenedia mine (EDA) and benzyldimethylamine (BDMA). Silsesquioxane-modified epoxy ne tworks showed a significant increase in the elastic modulus in the rubbery state, the abrasion resistance and the development of strain hardening in u niaxial compression tests.