Methods of rapid sedimentation and dynamic light diffusion have been used to obtain data on the molecular weight distributions and size of macromolecular coils in solution for phosphinated polystyrene, polyvinyl chloride and polybutadiene, which can be used as ligands of rhodium catalysts. It has been established that the introduction of diphenylphosphine groups by the reaction of brominated polystyrene or polyvinyl chloride with lithium diphenylphosphide and the radical addition of diphenylphosphine to polybutadiene are accompanied by partial degradation of the macromolecules. In a benzene-1-dodecene mixture at 20-59 degrees C, the size of the coils of phosphinated polystyrene increases with increasing dodecene content. Fixing of rhodium on the polymer leads to the partial aggregation of macromolecules.