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Epoxy resins typically applied for structural adhesives were toughened by poly(ε-caprolactones) (PCL) with different degree of branching. These PCL have the same molar mass and each arm is terminated with a hydroxyl group. The PCL were integrated into the epoxy network formed during the thermally induced cationic polymerization of a cycloaliphatic epoxy resin by the activated monomer mechanism. The PCL form domains covalently bound to the epoxy network and domain size decreases with increasing branching of the PCL. Interestingly the domains show characteristics from amorphous as well as crystalline behavior. Toughness of the formed epoxy resins increase with decreasing size of the domains in other words increasing degree of PCL branching.

Crystallinity as New Toughening Concept for Epoxy Resins:Influence of Branching of Integrated Polyester