Abstract: A method of conducting controlled radical polymerization, including: (a) providing a mixture of at least one monomer; at least one monomer solvent; at least one compound metal coordinating capable; and at least one initiator; (b) directing the mixture at a rate over a solid catalyst surface contained in an external chamber to the vessel, the catalyst including a metal or metal compound capable of at least two oxidation states; (c) monitoring the reaction vessel temperature; (d) adjusting the flow rate when the temperature is outside a selected temperature range; and (e) allowing the polymerization to proceed to desired conversion level.