Phase diagram of star polymer solutions

The phase diagram of star polymer solutions in a good solvent is obtained o ver a wide range of densities and arm numbers by Monte Carlo simulations. T he effective interaction between the stars is modeled by an ultrasoft pair potential which is logarithmic in the core-core distance. Among the stable phases are a fluid as well as body-centered cubic, face-centered cubic, bod y-centered orthogonal, and diamond crystals. In a limited range of arm numb ers, reentrant melting and reentrant freezing transitions occur for increas ing density.