Abstract
IT has been demonstrated by physical methods1 that in some polymers free radicals are formed during exposure to high-energy radiations, and that in some cases they can survive for long periods. These radicals can also be detected by chemical methods, and under suitable conditions they can be used for initiating the polymerization of typical monomers to give graft co-polymers2. In the preliminary work described here the formation of graft co-polymers has been detected by using a monomer labelled with carbon-14; by this means it has been possible to determine accurately very small weights of grafted material.
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