halogenated organic groups are covalently bonded to the carrier particle surface the base reactant used is typically a metal hydroxide such as naoh or koh primary secondary or tertiary amines such as methylamine dimethylamine triethylamine dimethylaniline and tributylamine metal alkyls wherein the metal is from group 1 2 13 and 14 of the periodic table and the alkyl are c 1 c 8 including n butyllithium dibutyl magnesium trimethylaluminum methyllithium preferred bases are naoh n butyllithium dibutyl magnesium triethyl amine and tributyl amine most preferred bases are naoh n butyllithium and tributylamine and mixtures thereof when an aqueous basic solution is used the resultant reaction product should have excess water removed the methods preferably involve formation of an initial mixture containing the carrier particles a base and the halogenated organic the initial mixture preferably also contains a solvent preferably non aqueous however neat mixtures of the carrier particles halogen and base may be used the ingredients forming the initial mixture may be combined in virtually any desired sequence to effect the desired transformation while the carrier particles may contain some free water it is preferred that any free water be removed before the initial mixture is formed for example by solvent exchange heating and chemical reaction the carrier particles are preferably porous the porosity of the particles is preferably dictated by the intended end use of the particles preferably the porosity of the particles to be deactivated is such that the resulting particles would be suitable for use as polyolefin catalyst supports the initial mixture preferably contains a solvent to facilitate intimate mixing of the carrier particles and the reagents the solvent is preferably a non aqueous solvent organic solvents such as c.