Interfacial micellar structures from novel amphiphilic star polymers

Interfacial micellar structures from novel amphiphilic star polymers

Copyright 2004 American Chemical Society

Bibliographische Detailangaben
Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 20(2004), 21 vom: 12. Okt., Seite 9044-52
1. Verfasser: Genson, Kirsten L (VerfasserIn)
Weitere Verfasser: Hoffman, Joshua, Teng, Jing, Zubarev, Eugene R, Vaknin, David, Tsukruk, Vladimir V
Format: Aufsatz
Sprache:English
Veröffentlicht: 2004
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Acrylic Resins Micelles Polystyrenes Water 059QF0KO0R carbopol 940 4Q93RCW27E
Beschreibung
Zusammenfassung:Copyright 2004 American Chemical Society
An amphiphilic heteroarm star polymer containing 12 alternating hydrophobic/hydrophilic arms of polystyrene (PS) and poly(acrylic acid) (PAA) connected to a well-defined rigid aromatic core was studied at the air-water and the air-solid interfaces. At the air-water interface, the molecules spontaneously form pancakelike micellar aggregates which measure up to several microns in diameter and 5 nm in thickness. Upon reduction of the surface area per molecule to 7 nm2, the two-dimensional micelles merged into a dense monolayer. We suggest that confined phase separation of dissimilar polymer arms occurred upon their segregation on the opposite sides of the rigid disklike aromatic core, forcing the rigid cores to adopt a face-on orientation with respect to the interface. Upon transfer onto solid supports the PS chains face the air-film interface making it completely hydrophobic, and the PAA chains were found to collapse and form a thin flattened underlayer. This study points toward new strategies to create large 2D microstructures with facial amphiphilicity and suggests a profound influence of star molecular architecture on the self-assembly of amphiphiles at the air-water interface
Beschreibung:Date Completed 25.04.2006
Date Revised 24.11.2016
published: Print
Citation Status MEDLINE
ISSN:1520-5827