The binuclear half-sandwich scandium aminobenzyl/chloride complex [(Cp')Sc(THF)Cl](2)[p-(CH2C6H3(o-NMe2)-)(2)] (C' = C5Me4SiMe3) (2) was synthesized by linking two scandium centers through a bis(aminobenzyl) fragment. When activated with a halide abstractor, [(Et3Si)(2)(mu-H)][B(C6F5)(4)], complex 2 is capable of copolymerizing styrene and epsilon-caprolactone to furnish ABA-type triblock copolymers (PCL-b-sPS-b-PCL) consisting of perfectly syndiospecific polystyrene (sPS) (B) in the midblock and tunable PCL (A) content in the end blocks. The stress-strain measurements of a solution casting film of copolymers demonstrated that the triblock copolymers exhibited superior mechanical performances compared to those diblock BA copolymers (sPS-b-PCL) prepared from mononuclear scandium aminobenzyl/chloride complex [(Cp')Sc(o-CH2C6H4-NMe2)-(THF)Cl](1).