CMC is not exactly an instantaneous â€œblack-whiteâ€ transition from a 100% random solution to a 100% micellar solution (where the micelle concentration is 100%) upon increasing copolymer levels or upon dilution (Loh 802). The figures do, however, change even if not by exactly 100%. Analysis of the block copolymer molecular structure results and the critical micelle concentration weight was undertaken by the use of ionic liquids (Ruiz et al. 3229) that acted as main model solvents. The researchers used Pyrene Fluorescence (Bains et al. 6209) to measure CMCs as a block MW function for three polystyreneâ€“poly (ethylene oxide) samples and three PSâ€“poly (methyl methacrylate) samples in 1-ethyl-3methylimidazolium bis(trifluoromethylsulfonyl) amide (Jean and Ache 984). The findings were that the amount of CMC reduced by a shy value of 1.5 in the PSPEO, in which the solvophobic PS block MW was unchanged at (20 000) or 100% while the PEO block MW reduced considerably from 15 000 to 3000. These findings conformed accurately with those of the self-consistent-field (SCF) theory (Egorov 2). A higher decrease of about 5 was observed in the PMMA series. Here the solvophobic PS block MW was increased from 3000 to 11 000 while keeping a persistent overall MW (ca. 15 000). However, this reduction was much weaker than the one forecasted by SCF calculations.
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