Abstract
The self-assembly of diblock copolymers/homopolymer blend in selective solvent was simulated by Dissipative particle dynamics simulation in this research. We investigated the effect of the polymer concentration, homopolymers length and the selective solvent properties on morphology transition. It is found that self-assembled nanostructures of different shapes (e.g., hamburger-like, sphere, multicompartment worm-like micelles) can be obtained by varying the Flory-Huggins interaction parameter between the solvophobic block and the solvent (χsolvophobic-solvent,χbs) and concentration of the polymer.When blending short chain homopolymers, it will distribute over A domain causing block copolymer A more extended. Comparing with the short chain, long chain homopolymers prefer to gather in the center of the micelle and compress block copolymer A. End to end distance of the block copolymer B is decreased with increasing χbs.Micellar size is also sensitive to the solvent property, which decreases with an increase of interactionsχbs, since system minimizes the total interfacial energy by compressing micellar size.By increasing the length of the block copolymer A can cover homopolymers more effectively in the multicompartment worm-like micelles when the fraction of the particle A is between 0.55 and 0.6.