Open AccessPhase Behavior of Amphiphilic Diblock Co-oligomers with Nonionic and Ionic Hydrophilic Groups
Author(s) -
Jennifer M. Heinen,
Annabelle Blom,
Brian S. Hawkett,
Gregory G. Warr
Publication year - 2013
Publication title -
the journal of physical chemistry b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 392
eISSN - 1520-6106
pISSN - 1520-5207
DOI - 10.1021/jp307875z
Subject(s) - amphiphile , lyotropic , oligomer , alkyl , polymer chemistry , monomer , materials science , lamellar structure , acrylate , copolymer , micelle , polymerization , small angle x ray scattering , chemical engineering , lamellar phase , phase (matter) , chemistry , crystallography , organic chemistry , polymer , aqueous solution , scattering , liquid crystalline , physics , engineering , optics
The synthesis of a series of co-oligomer amphiphiles by RAFT and their self-assembly behavior in water is described. These novel amphiphiles, comprised of styrene, butyl acrylate, and alkyl hydrophobes together with ionic acrylic acid and nonionic hydroxyethylacrylate hydrophilic moieties and with a total degree of polymerization from 5 to 17, represent a new class of small-molecule surfactants that can be formed from the immense potential library of all polymerizable monomers. Examples of micellar solutions and discrete cubic, hexagonal, lamellar, and inverted hexagonal lyotropic phases, as well as vesicle dispersions and coexisting lamellar phases, are reported and characterized by small-angle scattering. The variation of self-assembly structure with co-oligomer composition, concentration, and solution conditions is interpreted by analogy with the surfactant packing parameter used for conventional small-molecule amphiphiles.
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