Introduction. The self-organization of block copolymers constitutes a versatile means of producing ordered periodic structures with phase-separated microdomain sizes on the order of tens of nanometers. 1 By varying the relative molar masses of the blocks and the total molar mass, control over morphology, microdomain size, and spacing is easily achieved in the bulk state. In thin films, asymmetric block copolymers can self-assemble to ordered ...