Browsing by Author "Alexander, Bruce D"

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    Studying the interaction of hydrophobically modified ethoxylated urethane (HEUR) polymers with sodium dodecylsulfate (SDS) in updateft concentrated polymer solutions
    (ACADEMIC PRESS INC ELSEVIER SCIENCE, 11/01/2018) Griffiths, Peter C; Alexander, Bruce D; Szczygiel, Agnieszka; Murray, Martin; King, Stephen; Valencony, Jordane; Ibrahim, Mervat S.
    Findings: Binding of the SDS to the polymer via two mechanisms- monomeric anti-cooperative and micellar cooperative-leads to surfactant-concentration-specific macroscopic changes in the viscosity. Binding of the surfactant to the polymer drives a conformational rearrangement, and an associated redistribution of the polymer end-groups and linker associations throughout the hydrophobic domains. The composition and size of these domains are sensitive to the polymer architecture. Therefore, there is a complex balance between polymer molecular weight, ethylene oxide block size, and number of urethane linkers, coupled with the size of the hydrophobic end-groups. In particular, the urethane linkers are shown to play a hitherto largely neglected but important role in driving the polymer association. (C) 2018 Elsevier Inc. All rights reserved.