AFM study of micelle chaining in surface films of polystyrene-block-poly(ethylene oxide) stars at the air/water interface
FRANCIS, Raju
Dept Chem and Center for Macromol Sci and Eng, Univ Florida
Laboratoire de Chimie des polymères organiques [LCPO]
Dept Chem and Center for Macromol Sci and Eng, Univ Florida
Laboratoire de Chimie des polymères organiques [LCPO]
TATON, Daniel
Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
< Reduce
Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Language
en
Article de revue
This item was published in
Langmuir. 2005, vol. 21, n° 8, p. 3424-3431
American Chemical Society
English Abstract
A series of three-arm star block copolymers were examined using atomic force microscopy (AFM). These stars consisted of a polystyrene core composed of ca. 111 styrene units/branch with poly(ethylene oxide) (PEO) chains at ...Read more >
A series of three-arm star block copolymers were examined using atomic force microscopy (AFM). These stars consisted of a polystyrene core composed of ca. 111 styrene units/branch with poly(ethylene oxide) (PEO) chains at the star periphery. Each star contained different amounts of PEO, varying from 107 to 415 ethylene oxide units/branch. The stars were spread as thin films at the air/water interface on a Langmuir trough and transferred onto mica at various surface pressures. Circular domains representing 2D micelle-like aggregated molecules were observed at low pressures. Upon further compression, these domains underwent additional aggregation in a systematic manner, including micellar chaining. At this point, domain area and the number of molecules/domain increased with increasing pressure. In addition, it was found that longer PEO chains led to greater intermolecular separation and less aggregation. These AFM results correspond to attributes seen in the surface pressure-area isotherms of the stars. In addition, they demonstrate the viability of AFM as a quantitative characterization technique.Read less <
English Keywords
AGGREGATION
MOLECULAR BRUSHES
POLY(ETHYLENE OXIDE)
DYNAMIC PROPERTIES
AIR-WATER-INTERFACE
DIBLOCK COPOLYMER MONOLAYERS
ATOMIC-FORCE MICROSCOPY
BLOCK-COPOLYMER
POLYSTYRENE
POLYELECTROLYTES
Origin
Hal imported