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The elution behaviors of styrene-methyl methacrylate [P(St-MMA)] random copolymer and block copolymer with different compositions were characterized by eluent gradient highperformance liquid chromatography. P(St-MMA) samples were eluted depending on the styrene content with a linear gradient from 100 acetonitrile to 100 THF. The relation between the styrene content in P(St-MMA) and the composition of THF in the eluent at the time of P(St-MMA) eluting indicated a good correlation; the composition of THF in the eluent at the time of a random copolymer eluting differed from that at the time of the block copolymer of the same styrene content. Two random and block copolymer samples were characterized based on the molecular-weight dependence of the styrene content by 2D-HPLC.

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