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    Effect of Polyethylene Glycol on the Adsorption of Polymeric Surface Active Agent and the Stability of Concentrated Suspensions

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    The adsorption and the configuration of the polymeric surfactant at the solid / liquid interface are vital to the steric and electrostatic stability of suspension concentrates. The process of adsorption and the adsorption layer thickness to obtain the most stable system is a complex task and depends on many factors.

    This paper discusses the stages involved in the optimization of a suspension concentrate and the results of a study of the effect of polyethylene glycol on adsorption of block polymer where the molecular weights of two components are varied. A model system was chosen to study various physico chemical properties such as adsorption, wetting, contact angle, dynamic surface tension, dilution performance, suspensibility, freeze-thaw stability, particle size, and rheology. Our results showed interesting correlations between these properties and the structure of the polymeric surfactant.


    Polymeric surfactant, polyethylene glycols, configuration at interface, suspension concentrates, flowables, adsorption, dynamic surface tension

    Author Information:

    Memula, S
    Formulation Chemist, Witco Corporation, Houston, TX

    Jimenez, A
    Application Manager, Witco Corporation, Houston, TX

    Berger, CH
    Research Chemist, Witco Corporation, Houston, TX

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP25127S