info:eu-repo/semantics/article
Structure of Micelles Formed by Highly Asymmetric Polystyrene-b-Polydimethylsiloxane and Polystyrene-b-poly[5-(N,N-diethylamino)isoprene] Diblock Copolymers
Fecha
2010-09-19Registro en:
Giacomelli, Fernando C.; Riegel, Izabel C.; Stepanek, Petr; Petzhold, Cesar L.; Ninago, Mario Daniel; et al.; Structure of Micelles Formed by Highly Asymmetric Polystyrene-b-Polydimethylsiloxane and Polystyrene-b-poly[5-(N,N-diethylamino)isoprene] Diblock Copolymers; American Chemical Society; Langmuir; 26; 18; 19-9-2010; 14494-14501
0743-7463
CONICET Digital
CONICET
Autor
Giacomelli, Fernando C.
Riegel, Izabel C.
Stepanek, Petr
Petzhold, Cesar L.
Ninago, Mario Daniel
Satti, Angel Jose
Ciolino, Andrés Eduardo
Villar, Marcelo Armando
Schmidt, Vanessa
Giacomelli, Cristiano
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 with molar masses in the range of 12.0k-18.2k g/mol 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 copolymer micelles for generating thin films from preformed nano-objects, as well as the capability to function as nanoreactors in organic medium.