Cylindrical molecular brushes under poor solvent conditions: microscopic observation and scaling analysisS.S. Sheiko1, O.V. Borisov2, S.A. Prokhorova1 and M. Möller1
1 Organische Chemie III, Universität Ulm, 89069 Ulm, Germany
2 LRMP/UMR 5067 CNRS UPPA, 2 avenue du Président Angot, Helioparc Pau-Pyrénées, 64053 Pau Cedex 9, France
(Received 24 June 2002 / Received in final form 27 November 2003 / Published online 25 March 2004)
Axial contraction of cylindrical molecular brushes of polymethylmethacrylate was observed by static light scattering and scanning force microscopy. Single brush molecules were visualized as worm-like particles whose length was almost three times shorter than the contour length of the backbone. A somewhat larger length was measured by light scattering in a good solvent. A scaling approach has been used to analyze the driving forces for the axial contraction and the conformation of the molecular brushes.
36.20.-r - Macromolecules and polymer molecules.
36.20.Ey - Conformation (statistics and dynamics).
61.16.Ch - Scanning probe microscopy: scanning tunneling, atomic force, scanning optical, magnetic force, etc. .
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2004