Abstract
Copolymers of butyl acrylate (BA) and ethyl acrylate (EA) were prepared. Their conversion was kept below 10% for obtaining samples with a narrow chemical composition distribution. The composition of each sample was determined by 1H nuclear magnetic resonance (NMR). The mixture of the copolymers was separated depending on composition by normal and reversed phase high performance liquid chromatography (HPLC) using cross-linked acrylamide and styrene beads, respectively. Samples with higher BA content eluted earlier with normal phase HPLC, while opposite order with reversed phase HPLC, indicating that BA unit is less polar than EA unit. Observed composition distribution of copolymers was broader than the calculated one assuming copolymerization theory. The difference between them can mainly be explained by the peak broadening in the column and tailing.
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