INVESTIGADORES
NINAGO mario daniel
artículos
Título:
Structure of Micelles Formed by Highly Asymmetric Polystyrene-b-Polydimethylsiloxane and Polystyrene-b-poly[5-(N,N-diethylamino)isoprene] Diblock Copolymers
Autor/es:
FERNANDO C. GIACOMELLI; IZABEL C. RIEGEL; PETR STEPÁNEK; CESAR L. PETZHOLD; MARIO D. NINAGO; ANGEL J. SATTI; ANDRÉS E. CIOLINO; MARCELO A. VILLAR; VANESA SCHMIDT; CRISTIANO C. GIACOMELLI
Revista:
LANGMUIR
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2010 vol. 26 p. 14494 - 14501
ISSN:
0743-7463
Resumen:
The internal structure of polystyrene(PS)-shell micelles having core-forming blocks consisting of polydimethylsiloxane (PDMS) or poly[5-(N,N-diethylamino)isoprene] (PAI) was determined in detail by accessing the multilevel structural organization using static and dynamic light scattering and small-angle X-ray scattering techniques. Well-defined PS- b-PDMS and PS-b-PAI diblock copolymers were dispersed in cyclohexane, dimethylacetamide, or dimethylformamide. Colloidal nanoparticles exhibiting either swollen core with a large surface area per corona chain that enables the PS chains to assume a random coil conformation with Gaussian statistics, or compact core and slightly stretched PS chains in the corona were obtained. Therefore, the results of this study provide an interesting alternative allowing for precise control of the core and corona properties of PS-b-PDMS and PS-b-PAI micelles in selective solvents. Admittedly, such differences in terms of micellar properties can dictate the potential of block copolymermicelles for generating thin films frompreformed nano-objects, as well as the capability to function as nanoreactors in organic medium.