Surfactant modulated interaction of hydrophobically modified ethoxylated urethane (HEUR) polymers with impenetrable surfaces

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:539

Article

Ibrahim, Mervat Shafik^1,2  Rogers, Sarah³  Mahmoudi, Najet³  Murray, Martin⁴  Szczygiel, Agnieszka⁴  Green, Beth⁴  Alexander, Bruce D.¹  Griffiths, Peter C.¹ 

[1] Univ Greenwich, Fac Sci & Engn, Medway Campus, Chatham ME4 4TB, Kent, England

[2] Modern Sci & Arts Univ, Dept Pharmaceut, Fac Pharm, 26 July Mehwar Rd Intersect Wahat Rd, Cairo, Egypt

[3] Rutherford Appleton Lab, Sci & Technol Facil Council, ISIS Facil, Didcot OX11 0QX, Oxon, England

[4] AkzoNobel, Wexham Rd, Slough SL2 5DS, Berks, England

关键词: HEUR;    Latex;    SDS;    Solvent relaxation NMR;    PGSE-NMR;    Rheology;    SANS;   

DOI  :  10.1016/j.jcis.2018.12.059

来源: Elsevier

【 摘 要 】

Hypothesis: The presence of surfactant modulates the surface-chemistry-specific interaction of hard colloidal particles (latex) with HEUR polymers, principally through introducing a preferential solution interaction rather than a competitive surface interaction; addition of surfactant leads to a preponderance of polymer/surfactant solution complexes rather than surface-bound complexes. Experiments: A range of model formulations comprising a hexyl end-capped urethane polymer (C-6-L(EO100-L)(9)-C-6), sodium dodecylsulfate (SDS) and a series of polystyrene-butylacrylate latices (PS-BA-L) have been characterised in terms of rheology, particle surface area (solvent relaxation NMR), polymer conformation (small-angle neutron scattering) and solution composition to build up a detailed picture of the distribution of the HEUR in the presence of both surfactant and latex. Findings: There is very weak adsorption of C-6-L(EO100-L)(9)-C-6 to only the most hydrophobic latex surface studied, an adsorption that is further weakened by the addition of low levels of surfactant. Macroscopic changes in the hydrophobic latex system may be interpreted in terms of bridging flocculation at low polymer concentrations. No adsorption of C-6-L(EO100-L)(9)-C-6 is observed in the case of hydrophilic surfaces. In most cases, the observed behaviour of the ternary system (polymer/surfactant/particle) is highly reminiscent of the binary (polymer/surfactant) system at the appropriate composition, suggesting that the polymer/surfactant solution interaction is the dominant one. Crown Copyright (C) 2018 Published by Elsevier Inc. All rights reserved.

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