Fullerene-based star polyurethanes were synthesized. The relaxation of Fullerene-based star polyurethanes can be fitted successfully utilizing Havriliak-Negami (HN) function. The activation energy of glass-transition for star polyurethane was larger than it for linear polyurethane. The parameters, a and ab of HN function for the star polyurethane were quite different from it for linear polyurethane.
