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The kinetics of ethylene oxide (EO) polymerization in dimethyl sulfoxide with potassium tert-butoxide as initiator at 323, 333, and 343K has been studied. The process follows the first order with respect to initiator in the concentration range 1,5-5,9~10-3mol~dm~3 and the rates are the same as in the polymerization of EO with dimsylpotassium (potassium methylsulfinylmethanide). It is supposed that the tert-butoxide and dimsyl anions are equally effective as initiators and their ionization equilibrium does not affect the polymerization rate. The above conclusion agrees well with the very slow chain transfer to dimethyl sulfoxide in the anionic polymerization of EO.

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