A tubular reactor model for "living" free-radical polymerization is developed in this study. The model may be used as a tool to design efficient processes for tailored polymers from "living" free-radical polymerization. Examples presented include preparing bimodal polymers and copolymers of n-butyl acrylate and styrene. Residence time distribution effects on polymer properties are investigated by varying the Peclet number, to show the degree of backmixing that adversely affects polymer properties.