Microphase Separation Induced by Differential Interactions in Diblock Copolymer/Homopolymer Blends

Details Microphase Separation Induced by Differential Interactions in Diblock Copolymer/Homopolymer Blends Microphase Separation Induced by Differential Interactions in Diblock Copolymer/Homopolymer Blends

2009-06-11

arxiv.org/abs/0906.2205v2

J. Chem. Phys. 130, 234904 (2009)

Physics

Condensed Matter

Soft Condensed Matter

19 pages, 7 figures, submitted to J. Chem. Phys

Scientific paper

Phase behavior of diblock copolymer/homopolymer blends (AB/C) is investigated theoretically. The study focuses on a special case where all three binary pairs, A/B, B/C and C/A, are miscible. Despite the miscibility of the binary pairs, a closed-loop immiscible region exists in the AB/C blends when the A/C and B/C pair interactions are sufficiently different. Inside the closed-loop, the system undergoes microphase separation, exhibiting different ordered structures. This phenomenon is enhanced when the homopolymer (C) interacts more strongly to one of the blocks (A or B).

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