TEMPERATURE RISING ELUTION FRACTIONATION OF A RANDOM ETHENE STYRENE COPOLYMER/

A random ethene/styrene copolymer containing 13.8 mol-% styrene was pr epared with the Ziegler-Natta catalyst system Me(2)Si(Me(4)Cp)(N-t-but yl)TiCl2/methylaluminoxane and characterized by means of preparative t emperature rising elution fractionation (TREF) combined with size excl usion chromatography, NMR, differential scanning calorimetry and wide- angle X-ray scattering analyses of the copolymer fractions. Efforts ar e made to describe the distribution of the styrene content of the copo lymers using the Stockmayer-Tacx distribution function. Both, comonome r distribution and molar mass distribution strongly support the presen ce of a single type of catalytically active center.