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    Aggregation behaviour of poly(fluoro(meth)acrylate)-block-poly(acrylic acid) copolymers at the air/water interface

    Year: 2021

    Journal: J. Polym. Res., Volume 28, JUL

    Authors: Grigoreva, Alexandra; Tarankova, Kseniia; Zamyshlyayeva, Olga; Zaitsev, Sergey

    Organizations: Russian Foundation for Basic Research [19-03-00843]

    Keywords: Amphiphilic copolymers; Block copolymers; Self-assembly; Langmuir monolayer; Fluoropolymers

    The formation of monolayers of poly(fluoro(meth)acrylate)-b-poly(acrylic acid) (PFA-b-PAA) amphiphilic diblock copolymers at the air/water interface was characterized with the Langmuir film balance technique and atomic force microscopy. Both internal and external effects on the aggregation behaviour of the amphiphilic copolymers were considered. The structure of fluorinated hydrophobic part, as an internal factor, affects the surface behaviour of the amphiphilic copolymers through changes in the packing density of the hydrophobic core. The morphology of the LB films of all the three copolymers exhibit circular micelles with the hydrophobic core and hydrophilic coronas. The variation in pH and ionic strength leads to changes in charge distribution of PAA coronas. The surface area occupied by the PFA-b-PAA copolymers decrease with the rise of pH of subphase. The increase in salt concentration provides for the reduction of electrostatic repulsion between the hydrophilic blocks.
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