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2005-02-25 - Article/Dans un journal avec peer-review - Anglais - 7 page(s)

Ouarti N., Viville Pascal , Lazzaroni Roberto , Minatti E., Schappacher M., Deffieux A., Borsali R., "Control of the Morphology of Linear and Cyclic PS-b-PI Block Copolymer Micelles via PS Addition" in Langmuir, 21, 4, 1180-1186

  • Edition : American Chemical Society, Washington (DC)
  • Codes CREF : Chimie quantique (DI1321), Optique (DI1250)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) We have studied the effect of polystyrene (PS) homopolymer addition on the morphology of self-assembled block copolymer micelles made from linear or cyclic poly(styrene-b-isoprene), PS-b-PI, in a selective solvent for the PI block (heptane). Both copolymers have the same composition: the degree of polymerization is 290 for the PS block, and 110 for the PI block, and we focused on the influence of the addition of small amounts of PS homopolymer on the micellar morphology. For the copolymer concentrations considered, the linear copolymer self-organizes into spherical micelles while the cyclic copolymer forms cylindrical micelles. PS and PI chains constitute the core and the corona of these micelles, respectively, due to the different affinity of the blocks for heptane. Consequently, the PS homopolymer added is “solubilized” into the micellar core. Dynamic light scattering (DLS) data combined with atomic force microscopy (AFM) results show that the addition of PS homopolymer induces a drastic change in the micellar organization. Indeed, a morphological transition, from spheres to cylinders for the linear copolymer, and from cylinders to vesicles for the cyclic copolymer, is observed. These results highlight the fact that a small incorporation of PS homopolymer is clearly sufficient to modify the morphology (size and shape) of the micelles. This approach could be a key parameter for the design/control of micelles for specific applications in nanotechnology.

Notes :
  • (Anglais) Publié en ligne le 15 janvier 2005
Identifiants :
  • DOI : 10.1021/la048944f