Block copolymers containing epsilon-caprolactone were synthesized. Mechanical properties as a function of chemical composition and domain structure as a function of elongation were studied. Based on previous optimal conditions determination by factorial design of experiments of e-caprolactone anionic polymerization, polystyrene-block-poly(e-caprolactone), polyisoprene-block-poly(e-caprolactone), polystyrene-block-polybutadiene-block-poly(e-caprolactone)