Structural Transitions from Spherical to Nonspherical Micelles in Blends of Poly(styrene-butadiene) Diblock Copolymer and Polystyrene Homopolymers

摘要: Blending of a block copolymer with large amount homopolymer can result in the formation micellar phase consisting spherical domains aggregating block. We show that transitions micelle shape and mesophase type($ occur by increasing molecular weight matrix, weight, or volume fraction copolymer. The new morphologies include cylindrical micelles, vesicles, lamellar type structures. These be understood terms general rule domain morphology as function relative microphase fractions put forth Molaul for neat copolymers later extended Sadron Gallot2 to case preferential solvents.