Micellar and surface properties of a poly(methyl methacrylate)-block-poly(N-isopropylacrylamide) copolymer in aqueous solution

Journal of Colloid and Interface Science
Antonios KelarakisIan W Hamley

Abstract

Critical micelle concentrations (cmc) of aqueous solutions of poly(methyl methacrylate)-block-poly(N-isopropylacrylamide) were determined at several temperatures by surface tensiometry. Below the lower critical solution temperature (LCST), the low Delta mic H 0 determined can be assigned to the PMMA block being tightly coiled in the dispersed molecular state, so that the unfavorable interactions of hydrophobic entities with water are minimized. Above the LCST the cmc value was found to increase; an anomalous behavior that can be directly related to the micelle-globule transition of the hydrophilic block. Interestingly, above the LCST the surface tension of relatively concentrated solutions was found to depend weakly on temperature not following the usual strong decrease with temperature expected for aqueous solutions.

References

Oct 31, 1998·Journal of Controlled Release : Official Journal of the Controlled Release Society·F KohoriT Okano
Nov 16, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Chengming LiAndrew L Lewis
Aug 23, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Pablo TaboadaColin Booth

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Citations

Mar 19, 2013·Journal of Colloid and Interface Science·Sabrina BelbekhoucheStéphane Alexandre

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