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Block Copolymer Microdomain Morphologies by Phase Detection Imaging

Published online by Cambridge University Press:  10 February 2011

Ph. Leclère,
J. M. Yu,
R. Lazzaroni,
Ph. Dubois,
R. JéRôme and
J. L. Brédas
Ph. Leclère
Affiliation:
Service de Chimie des Matériaux Nouveaux, Université de Mons-Hainaut, B-7000 Mons, Belgium.
J. M. Yu
Affiliation:
Center for Education and Research on Macromolecules (CERM), Université de Liège, Institut de Chimie, Bât B6a, B-4000 Sart-Tilman (Liège), Belgium.
R. Lazzaroni
Affiliation:
Service de Chimie des Matériaux Nouveaux, Université de Mons-Hainaut, B-7000 Mons, Belgium.
Ph. Dubois
Affiliation:
Center for Education and Research on Macromolecules (CERM), Université de Liège, Institut de Chimie, Bât B6a, B-4000 Sart-Tilman (Liège), Belgium.
R. JéRôme
Affiliation:
Center for Education and Research on Macromolecules (CERM), Université de Liège, Institut de Chimie, Bât B6a, B-4000 Sart-Tilman (Liège), Belgium.
J. L. Brédas
Affiliation:
Service de Chimie des Matériaux Nouveaux, Université de Mons-Hainaut, B-7000 Mons, Belgium.
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Abstract

Atomic Force Microscopy with Phase Detection Imaging is used to study the surface microdomain morphology of thick (i.e., ca. 2 mm) films of triblock copolymers, such as polymethylmethacrylate - block - polybutadiene - block - polymethylmethacrylate copolymers prepared by a well-taylored two-step sequential copolymerization promoted by a 1,3-diisopropenylbenzene based difunctional anionie initiator. By means of this new scanning probe microscopy technique, it is shown that the surface exhibits a segregated microphase structure, corresponding to the different types of components predicted theoretically by thermodynamic processes. We investigate the relationships between the size and characteristics of the microdomain structure as a function of the molecular parameters of the constituent polymers. Our data illustrate the interest of Phase Detection Imaging in the elucidation of surface phase separation in block copolymers.

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References

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