Phase Behavior of ABn Miktoarm Star Copolymers in the Presence of a Selective Solvent by Self-consistent Mean-Field Theory
Date Issued
2009
Date
2009
Author(s)
Yang, Li-Fan
Abstract
We employ the self-consistent mean-field (SCMF) theory in studying the phase behavior for ABn miktoarm star copolymers in the presence of a selective solvent. When the solutions are concentrated, the formation of equilibrium morphology is still mainly dominated by the composition f. When the B-selective solvent is added, the A15 structure will be more stable with increasing the solvent selectivity in both normal and inverted structure systems formed by A blocks. But when the A-selective solvent is added, because the junction point of the star copolymer does not all stay in the AB interface, the A15 structure does not exist in both normal and inverted structure systems formed by B blocks. In the inverted structure formed by the majority systems, BCC structure will vanish and be replaced by A15 or FCC structures under high solvent selectivity. In the A-formed inverted, B-formed normal and inverted structures, the phase behavior does not have significant effect with increasing the number of B blocks n.
Subjects
Self-consistent Mean-Field Theory
Miktoarm Star Copolymers
Selective Solvent
Phase Behavior
Type
thesis
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