Narrainen, A. P. and Clarke, N. and Eggleston, S. M. and Hutchings, L. R. and Thompson, R. L. (2006) 'Surface adsorption of polar end-functionalised polystyrenes.', Soft matter., 2 (11). pp. 981-985.
Due to their inherently high surface energy, polar end-functionalised polymers do not normally adsorb to the external surfaces of blends. However, adsorption of polar functionalities can be induced rapidly by annealing in a polar environment such as glycerol prior to quenching to a glassy state. Blended films of carboxy end-functionalised deuteriopolystyrene (dPS-COOH) with hydrogenous polystyrene (hPS) were annealed at 150 °C under glycerol. Nuclear reaction analysis was used to quantify the surface excess of dPS-COOH retained at the surface after quenching the films to below the glass transition temperature. Incorporation of multiple COOH groups onto a single chain end greatly increases the affinity of these chains to the interface with glycerol. Here we have shown that even a difunctional material, dPS-2COOH, is much more surface active than either the singly functionalised dPS-COOH or the difunctional ester from which it was prepared. Self-consistent mean field theory yielded thermodynamic sticking energy values per functionality at the polystyrene–glycerol surface of 1.3–1.7 kBT for carboxy groups and 0.3 kBT for ester groups.
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|Publisher Web site:||http://dx.doi.org/10.1039/b608688h|
|Record Created:||25 Sep 2008|
|Last Modified:||08 Apr 2009 16:31|
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