Journal Article10.1021/JA953709S
Multiple Morphologies and Characteristics of “Crew-Cut” Micelle-like Aggregates of Polystyrene-b-poly(acrylic acid) Diblock Copolymers in Aqueous Solutions
Lifeng Zhang and,Adi Eisenberg +1 more
1.2K
TL;DR: In this paper, the insoluble block (PS) contents in the copolymers ranged from 80 to 98 wt % and the micelle cores, formed by aggregation of the PS blocks, were generally monodisperse.
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Abstract: Crew-cut micelle-like aggregates of various morphologies prepared from polystyrene-b-poly(acrylic acid), PS-b-PAA, diblock copolymers under near-equilibrium conditions, were studied by transmission electron microscopy (TEM). The insoluble block (PS) contents in the copolymers ranged from 80 to 98 wt %. In spherical micelles, the micelle cores, formed by aggregation of the PS blocks, were generally monodisperse. A comparison between star and crew-cut micelles showed that the latter are distinguished by a low density of corona chains on the core surface and a low degree of stretching of the PS blocks in the cores. As the PAA content in block copolymer decreased, the morphology of the aggregates changed progressively from spheres to cylinders, to bilayers (both vesicles and lamellae), and eventually to compound micelles consisting of an assembly of inverted micelles surrounded by a hydrophilic surface. The compound micelles are believed to be a new morphology for block copolymers. The addition of homopolysty...
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Citations
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References
Synchrotron SAXS measurements on solutions of poly(styrene-isoprene) AB block copolymer in aniline
TL;DR: In this paper, the SAXS results were obtained with a sufficient precision, which allowed the conclusion that the aggregates were vesicle-like when the PS block was sufficiently short.
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Chain Segregation in Block Copolymers
TL;DR: In block and graft copolymers, the different types of chains (i.e. the component blocks or the grafts and backbone) are bonded together covalently, thereby preventing immiscibility from leading to phase separation on the macroscopic scale as discussed by the authors.
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