Atomic force microscopy study of comb-like vs. arborescent graft copolymers in thin films
2004; Elsevier BV; Volume: 45; Issue: 6 Linguagem: Inglês
10.1016/j.polymer.2004.01.030
ISSN1873-2291
AutoresPascal Viville, Philippe Leclère, Alain Deffieux, Michel Schappacher, Julien Bernard, Rédouane Borsali, Jean‐Luc Brédas, Roberto Lazzaroni,
Tópico(s)Force Microscopy Techniques and Applications
ResumoThis work deals with the study of comb-like vs. arborescent grafted copolymers made of poly(chloroethyl vinyl ether)-g-polystyrene (PCEVE-g-PS). We describe how the molecular architecture of the branched polymers affects their nanoscale organization in thin films, as observed using atomic force microscopy. The results indicate that modifying the molecular architecture from a ‘generation-zero’ comb-like (PCEVE-g-PS) to a ‘first-generation’ hyperbranched (PCEVE-g-(PS-b-PCEVE-g-PS)) architecture strongly modifies the observed geometrical parameters of the molecules, in good agreement with the expected evolution of the molecular dimensions and the corresponding data obtained in solution. The surface organization of the (PCEVE-g-PS) copolymer molecules is also strongly conditioned by the interplay between the molecule–substrate interactions and the molecule–molecule interactions, leading to different possible orientations of the lateral branches with respect to the surface and thus to different final morphologies.
Referência(s)