Reference : Direct observation of microdomain morphology in "all-acrylic" thermoplastic elastomers s...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/14857
Direct observation of microdomain morphology in "all-acrylic" thermoplastic elastomers synthesized via living radical polymerization
English
Leclère, Philippe [University of Mons-Hainaut (UMH) > > Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaires > >]
Moineau, Georges [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Minet, Michaël [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Dubois, Philippe [University of Mons-Hainaut (UMH) > > Laboratory of Polymeric and Composite Materials (SMPC) > >]
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) > > Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaires > >]
Lazzaroni, Roberto [University of Mons-Hainaut (UMH) > > Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaires > >]
25-May-1999
Langmuir
Amer Chemical Soc
15
11
3915-3919
Yes (verified by ORBi)
International
0743-7463
Washington
[en] radical polymerization ; atom transfer radical polymerization (ATRP) ; thermoplastic elastomer
[fr] nanostructured material ; self-assembly in bulk
[en] We investigate the microscopic morphology of thin films of symmetric triblock copolymers synthesized via a two-step “living” radical polymerization of n-butylacrylate and methyl methacrylate. These copolymers with low poly(methyl methacrylate) contents constitute a new class of potential thermoplastic elastomers with higher service temperature and oxidation resistance compared to conventional polydiene−polystyrene-based thermoplastic elastomers. The straightforward synthetic pathway allows for strict control of molecular weight, molecular-weight distribution, and composition. The presence in the copolymer of immiscible segments covalently bound to each other leads to phase separation on the nanometer scale. Regular organization of the phase-separated nanodomains is observed in real space by scanning force microscopy. The data point to a strong contrast in the local mechanical properties, corresponding to the microphase morphology. Cylinders of the minority phase are found to orient perpendicular to the surface, because of the surface energy difference between the constituents. Lamellae are also arranged perpendicular to the surface, in contrast to what is usually observed in block copolymers. This particular orientation is thought to result from the symmetric character of these triblock systems, with the outer blocks more polar than the central sequence.
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-Objectif1-Hainaut) ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; IBM ; Elf Atochem
Researchers
http://hdl.handle.net/2268/14857
10.1021/la981273z
http://pubs.acs.org/doi/pdf/10.1021/la981273z

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