and the perfluoro alkyl vinyl ether and their polymerization are desribed in harris et al u s pat no 3 132 123 which is hereby incorporated by reference of the perfluoro alkyl vinyl ethers perfluoro methyl vinyl ether pmve has been found to be particularly satisfactory other perfluoro alkyl vinyl ethers which can be used in the present invention include perfluoro alkoxy alkyl vinyl ethers such as those described in fritz et al u s pat no 3 291 843 also hereby incorporated by reference of those perfluoro alkoxy alkyl vinyl ethers perfluoro 5 methyl 3 6 dioxa 1 nonene has been found to be particularly satisfactory a wide variety of bromo cure sites can be incorporated into these polymers including those described in apotheker et al u s pat no 4 035 565 hereby incorporated by reference the polymers resulting from the process of this invention preferably contain such curesites randomly distributed along the backbone of the perfluoropolymer a central aspect of the present invention is that the perfluoropolymer comprise iodine moieties the iodo moieties can be incorporated by conducting the radical copolymerization of the basic monomers noted above in the presence of an iodine containing compound represented by the formula ri x where r is a hydrocarbon or saturated fluorocarbon or chlorofluorocarbon residue having 1 to 8 carbon atoms and x is an integer of 1 or 2 corresponding to the valence of the residue r in the course of the radically initiated copolymerization the iodo compound acts as a chain transfer agent resulting in a telomerization polymerization process in which a labile iodine containing chain.