Abstract:

Based on the selfconsistent field theory of lattice model in two dimension space, the selfassembly of the blends of diblock copolymers was studied. For the blends of long/small two diblock copolymers in which volume fraction of rod block equal that of coil block, when blend fraction of the two diblocks was not comparable, lamellae were observed, and their thickness was  related with the length of the big blend fraction of the two diblock copolymers; on the other hand, as blend fraction of the two diblocks is comparable, the new ordered structures, including lamellar strips and coexisted lamellae and strips, were observed. These new ordered structures did not appear in the rod/coil diblock copolymer melts. The results are related to the asymmetry of the chain conformation and the blend of rod/coil diblock copolymer.

Key words: rod/coil diblock copolymer, blends, self-assembly, self-consistent field theory