radical polymerization; atom transfer radical polymerization (ATRP); thermoplastic elastomer; nanostructured material; self-assembly in bulk
Abstract :
[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.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Leclère, Philippe; University of Mons-Hainaut (UMH) > Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaires
Moineau, Georges; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Minet, Michaël; Université de Liège - ULiège > 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 ; Université de Liège - ULiège > 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
Language :
English
Title :
Direct observation of microdomain morphology in "all-acrylic" thermoplastic elastomers synthesized via living radical polymerization
Publication date :
25 May 1999
Journal title :
Langmuir
ISSN :
0743-7463
eISSN :
1520-5827
Publisher :
Amer Chemical Soc, Washington, United States - Washington
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique the European Commission and the Government of the "Région Wallonne" (Project NOMAPOL-Objectif1-Hainaut) F.R.S.-FNRS - Fonds de la Recherche Scientifique IBM Elf Atochem
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