SEPARATION OF COPOLYMERS BY ADSORPTION LIQUID-CHROMATOGRAPHY

Binary random copolymers of styrene with butadiene, methyl methacrylat e, and t-butyl methacrylate, and styrene-methyl methacrylate-acrylonit rile random terpolymers were separated by adsorption chromatography. T he HPLC conditions required for the sample to adsorb to the stationary phase are discussed. Sequence length as well as composition affected the elution volume of block and graft copolymers of styrene and butadi ene. A mixture of terpolymers having different composition was separat ed to each component by cross-fractionation using two types of adsorpt ion chromatography.