Electron spin rhonanace technique wu uled for detecting the role of radical inter­mediates In the iodine initiated polymerisation of alkyl vinyl ethers. DPPH was used as a radical scavanpr. The JeaCtion was carded out In the presence of DPPH to find a clue to the presence of a free radical in the system. The results clearl~ indicated the presence of a radical intermOdiate in the reaction.