Reference : Microphase separation at the surface of block copolymers, as studied with atomic forc...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/14752
Microphase separation at the surface of block copolymers, as studied with atomic force microscopy
English
Rasmont, A. [University of Mons-Hainaut (UMH) > Centre de Recherche en Electronique et Photonique Moléculaires > Service de Chimie des Matériaux Nouveaux > >]
Leclère, Philippe [University of Mons-Hainaut (UMH) > Centre de Recherche en Electronique et Photonique Moléculaires > Service de Chimie des Matériaux Nouveaux > >]
Doneux, C. [University of Mons-Hainaut (UMH) > Centre de Recherche en Electronique et Photonique Moléculaires > Service de Chimie des Matériaux Nouveaux > >]
Lambin, G. [University of Mons-Hainaut (UMH) > Centre de Recherche en Electronique et Photonique Moléculaires > Service de Chimie des Matériaux Nouveaux > >]
Tong, Jiang Dong [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Jérôme, Robert mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Brédas, Jean-Luc [University of Mons-Hainaut (UMH) > Centre de Recherche en Electronique et Photonique Moléculaires > Service de Chimie des Matériaux Nouveaux > >]
Lazzaroni, Roberto [University of Mons-Hainaut (UMH) > Centre de Recherche en Electronique et Photonique Moléculaires > Service de Chimie des Matériaux Nouveaux > >]
30-Dec-2000
Colloids and Surfaces B : Biointerfaces
Elsevier
19
4
381-395
Yes (verified by ORBi)
International
0927-7765
[en] self-assembly in bulk ; atomic force microscopy (AFM) ; block copolymer
[fr] thermoplastic elastomer
[en] Atomic force microscopy (AFM) is used to study the phase separation process occurring in block copolymers in the solid state. The simultaneous measurement of the amplitude and the phase of the oscillating cantilever in the tapping mode operation provides the surface topography along with the cartography of the microdomains of different mechanical properties. This technique thus allows to characterize the size and shape of those microdomains and their organization at the surface (e.g. cubic lattice spheres, hexagonal lattice of cylinders, or lamellae). In this study, a series of symmetric triblock copolymers made of a inner elastomeric sequence (poly(butadiene) or poly(alkylacrylate)) and two outer thermoplastic sequences (poly(methylmethacrylate)) is analyzed by AFM in the tapping mode. The microphase separation and their morphology are essential factors for the potential of these materials as a new class of thermoplastic elastomers. Special attention is paid to the control of the surface morphology, as observed by AFM, by the molecular structure of the copolymers (volume ratio of the sequences, molecular weight, length of the alkyl side group) and the experimental conditions used for the sample preparation. The molecular structure of the chains is completely controlled by the synthesis, which relies on the sequential living anionic polymerization of the comonomers. The copolymers are analyzed as solvent-cast films, whose characteristics depend on the solvent used and the annealing conditions. The surface arrangement of the phase-separated elastomeric and thermoplastic microdomains observed on the AFM phase images is discussed on the basis of quantitative information provided by the statistical analysis by Fourier transform and grain size distribution calculations.
Center for Education and Research on Macromolecules (CERM)
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; The European Commission and the Government of the "Région Wallonne " (Project NOMAPOL-Objectif 1-Hainaut) ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Researchers
http://hdl.handle.net/2268/14752
10.1016/S0927-7765(00)00146-6
http://www.elsevier.com/wps/find/journaldescription.cws_home/523888/description#description
The authors acknowledge Colloids and Surfaces B-Biointerfaces (Elsevier) for allowing them to archive this paper.

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