Association properties of diblock copolymers of ethylene oxide and 1,2-butylene oxide in aqueous solution. Copolymers with oxyethylene-block lengths in the range 100-400 chain units

Withawat Mingvanish, Shao Min Mai, Frank Heatley, Colin Booth, David Attwood

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Copolymers E96B18, E184B18, E315B17, and E393B19 (E = oxyethylene unit, B = oxybutylene unit) were synthesized and characterized by gel permeation chromatography (for distribution width) and 13C NMR spectroscopy (for absolute molar mass and composition). Dynamic and static light scattering was used to determine micellar properties in dilute aqueous solution at three temperatures (25, 40, and 50 °C): that is, hydrodynamic radius and hydrodynamic expansion factor, mass-average molar mass, and thermodynamic expansion factor. At a given temperature, the values of the radii and expansion factors increased as E-block length was increased, whereas values of the micelle association number decreased. The tube-inversion method was used to define the mobile-immobile (hard gel) phase boundary. At room temperature (20 °C), hard gels were formed in the concentration range 3.5-8 wt % copolymer depending on E-block length, the lowest value being for the copolymer with the longest E block (E398B19). © 1999 American Chemical Society.
    Original languageEnglish
    Pages (from-to)11269-11274
    Number of pages5
    JournalJournal of Physical Chemistry B
    Volume103
    Issue number51
    Publication statusPublished - 23 Dec 1999

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