Effects of Intermicellar Interactions on the Dissociation of Block Copolymer Micelles: SANS and NMR Studies
Gang Cheng, Boualem Hammouda, Dvora Perahia
The effects of inter-micellar interactions on the dissociation of block copolymer micelles of polystyrene-b-polyisoprene in a selective solvent, decane, were investigated using small angle neutron scattering (SANS) and 1H NMR. This well-studied polymer has been used as a model system to correlate intermicellar interactions with overall micellar stability. Decane is a preferential solvent for polyisoprene (PI) and drives the association of the polystyrene (PS) blocks, resulting in spherical micelles with a PS core and a Gaussian PI corona. The dissociation of PS-PI micelles was triggered by increasing temperature, while the inter-micellar interactions were controlled by varying the polymer concentration and modulating temperature. With increasing temperature, the cores of the micelles first swell, followed by a breakdown to smaller micelles, with similar shapes, that eventually dissociate into single molecules. Herein, we have shown for the first time that enhancing the inter-micellar interaction delays the dissociation process of the micelles.
, Hammouda, B.
and Perahia, D.
Effects of Intermicellar Interactions on the Dissociation of Block Copolymer Micelles: SANS and NMR Studies, Macromolecular Chemistry and Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=914933
(Accessed June 5, 2023)