STP1527

    EW Formulations Using Polymeric Surfactants

    Published: Feb 2011


      Format Pages Price  
    PDF (2.1M) 12 $25   ADD TO CART
    Complete Source PDF (29M) 12 $89   ADD TO CART


    Abstract

    Four polymeric surfactants of consistent chemistry with different architectures were evaluated in concentrated emulsions, also known as emulsions in water (EW), of 2,4-dichlorophenoxyacetic acid, 2-ethylhexyl ester (2,4-D ester). EW dilution performance was evaluated using the ASTM E1116-98 standard emulsion test, and the emulsion was analyzed for droplet size distribution using a light scattering technique; zeta potential was determined, and rheology measured. A structure-property-performance relationship for these polymeric surfactants in the subject EW was developed. All four polymeric surfactants proved to be effective in formulating stable EWs with the corresponding emulsion stability increasing positively in the order of random, triblock, quasi-diblock, and finally diblock. Preferred polymeric surfactant performance in EW provided small droplet sizes with excellent dilution stability due primarily to the steric stabilization of the dispersed phase in both the concentrates and upon dilution.

    Keywords:

    polymeric surfactant, concentrated emulsions, emulsion stability, 2,4-dichlorophenoxyacetic acid ethyl hexyl ester, structure-property relationship, random copolymer, block copolymer, quasi-block copolymer


    Author Information:

    Hu, Qiang
    Research Chemist, Croda, Inc., New Castle, DE

    Lindner, Gregory J.
    Research Manager, Crop Care, Croda, Inc., New Castle, DE


    Paper ID: STP152720120006

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP152720120006


    CrossRef ASTM International is a member of CrossRef.