Abstract
(AB)n-type star copolymers (arm numbersn= 14 and 16; polyisoprene blocks = 23–24 mol%) were prepared by anionic copolymerization of polystyrene-block-polyisoprene diblock anions with divinylbenzene. The structural ordering of such star-block copolymers was investigated through small-angle X-ray scattering and electron microscopy. (AB)n-type stars formed a body-centered cubic (BCC) structure near the overlap threshold (C*). This structure changed to a mixed lattice of BCC and face-centered cubic (FCC) structure with increasing polymer concentration. Near the bulk, such stars formed a FCC structure. It was concluded that (AB)n-type stars led to hierarchical transformation of the cubic lattices from theC* threshold into a continuous film.
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