{HEAD ~ Metallation} is accomplished with an alkyllithium compound and at least one activating reagent after {TAIL ~ a slurry} of the copolymer in a nonreactive, saturated, nonpolar hydrocarbon solvent is first heated to a temperature greater than 80° Centigrade to provide the polymer with an expanded settling volume greater than its original settling volume 
{ HEAD ~ Metallation } is accomplished with an alkyllithium compound and at least one activating reagent after { TAIL ~ a slurry } of the copolymer in a nonreactive , saturated , nonpolar hydrocarbon solvent is first heated to a temperature greater than 80 ° Centigrade to provide the polymer with an expanded settling volume greater than its original settling volume
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