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

DOI: 10.1016/j.jcis.2007.12.030 DOI Help
PMID: 18206903 PMID Help

Authors: Antonios Kelarakis (National and Kapodistrian University of Athens) , Tian Tang (University of Reading) , Vasiliki Havredaki (National and Kapodistrian University of Athens) , Kyriakos Viras (National and Kapodistrian University of Athens) , Ian W. Hamley (The University of Reading)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Colloid Interface Science , VOL 320 (1) , PAGES 70-73

State: Published (Approved)
Published: April 2008

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. (C) 2007 Elsevier Inc. All rights reserved.

Subject Areas: Chemistry, Materials

Instruments: NONE-No attached Diamond beamline

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