 Typically a monomer of a lower molecular weight is copolymerized with free radicals with an acrylate functionalized macromonomer.The ratio of monomer to macromonomer molar concentrations as well as their copolymerization behavior determines the number of chains that are grafted.As the reaction proceeds, the concentrations of monomer to macromonomer change causing random placement of branches and formation of graft copolymers with different number of branches.