Condensed States of a Semiflexible Copolymer in a Poor Solvent: Figures of Eight and Discrete Toroids

We examine the problem of a semiflexible (stiff) copolymer chain in a selective solvent. In the homopolymer case toroids often result. In the copolymer case the phase diagram is much richer. One can obtain striped toroids, figure eights, cages and many other stuctures. We will present simple analytical results for some of these along with computer simulations showing a variety of morphologies. One major result, is that for copolymers the structures must be discrete so the size of the toroids is effectively quantised.