Abstract
The mechanism of the fractionation of two-block AB copolymers (BC), consisting of polystyrene (PS) as block A and poly( tert.-butyl methacrylate) (PtBMA) as block B, was studied by thin-layer chromatography (TLC). It is shown that under the critical conditions for TLC [critical TLC (CTLC)], the PS blocks of BC are fractionated by the mechanism of exclusion TLC (ETLC) of the PS block (whereas the PtBMA block of BC is chromatographically invisible) and the PtBMA blocks of BC are fractionated by ETLC of the PtBMA block (whereas the PS block of BC is chromatographically invisible). The molecular weights (MW) of BC were determined by the ETLC method and those of PS and PtBMA blocks under the conditions of CTLC (PtBMA)-ETLC (PS) and CTLC (PS)-ETLC (PtBMA). The calculated compositions of the analysed BC correspond to the data calculated from the kinetics of copolymerization and microcolumn exclusion chromatography.
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