| Popis: |
We discuss some morphologies for triblock copolymers with a rigid, unsoluble part (R) at the center and two flexible, soluble parts (F) - plus a solvent (S). Aggregation may lead to plates of R, covered by brushes of F (the rod axis being tilted, as analyzed by A. Halperin). But, in certain conditions, because the F portions repel each other, the plates may be replaced by “needles” of R: the F chains can expand more freely near the tips of each needle, as first noticed (in different context) by A. Skoulios. We show that this gives an energy drop proportional to the perimeter of the brush region. A third possibility is based on a “fence” of R rods, decorated at both ends by “bottle-brushes” of F. We also analyze the energy of these “bottle-brushes”. |
