Abstract
The development characteristics in thin-layer chromatography was studied for block copolymers of BAB-type with equimolar composition but different molecular weights, where A and B are polystyrene (PS) and poly(methyl methacrylate) (PMMA), respectively. The values of Rf (rate of flow) obtained with a developer composed of nitroethane and acetone decreased with increasing molecular weight, whereas those with other developers, which behave as good solvents for both PS and PMMA, were little dependent on molecular weight. In view of our previous finding that the molecular weight dependence of Rf appears only when phase separation of sample polymer takes place during the development, the solution state of block copolymers in the solvent mixture of nitroethane and acetone was investigated by means of phase equilibrium and ultracentrifugation. No phase separation was observed. Thus a pertinent elucidation for the molecular weight dependence of Rf was given by taking into consideration that the random flight conformation of block copolymers collapses due to intramolecular phase separation between the block portions of PS and PMMA, which will be brought about because both solvents are nonsolvents for PS but good solvents for PMMA.
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Kamiyama, F., Inagaki, H. & Kotaka, T. Thermodynamic and Conformational Properties of Styrene–Methyl Methacrylate Block Copolymers in Dilute Solution. VI. Chain Conformations Disclosed by Thin-Layer Chromatography. Polym J 3, 470–475 (1972). https://doi.org/10.1295/polymj.3.470
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DOI: https://doi.org/10.1295/polymj.3.470