Influência da Estrutura química do co-mon？mero nas propriedades mecanicas e adesivas de redes epoxídicas

the mechanical and adhesive properties of epoxy formulations based on diglycidyl ether of bisphenol a cured with various aliphatic amines were evaluated in the glass state. impact and uniaxial compression tests were used to determine the impact energy, elastic modulus and yield stress, respectively. the adhesion tests were carried out in steel-steel joints using single lap shear, t-peel and impact adhesive joints geometry. the better mechanical and adhesive behavior of the networks is obtained for highly flexible chains and/or a high elastic modulus. the 1-(2-aminoethyl)piperazine epoxy network presents the best adhesive properties, high flexibility, and the largest impact energy. however, it possesses low elastic modulus and yield stress. also, it exhibits increased peel strength and impact energy with a reduction in the lap shear strength.