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Interaction of cylindrical polymer brushes in dilute and semi-dilute solution |
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| Authors: | Sreenath Bolisetty Sabine Rosenfeldt Christophe N Rochette Ludger Harnau Peter Lindner Youyong Xu Axel H E Müller Matthias Ballauff |
| Institution: | 1.Physikalische Chemie I,University of Bayreuth,Bayreuth,Germany;2.Max-Planck-Institut für Metallforschung,Stuttgart,Germany;3.Institut für Theoretische und Angewandte Physik,Universit?t Stuttgart,Stuttgart,Germany;4.Institut Laue-Langevin,Grenoble Cedex,France;5.Makromolekulare Chemie II,University of Bayreuth,Bayreuth,Germany |
| Abstract: | We present a systematic study of flexible cylindrical brush-shaped macromolecules in a good solvent by small-angle neutron scattering (SANS), static light scattering (SLS), and by dynamic light scattering (DLS) in dilute and semi-dilute solution. The SLS and SANS data extrapolated to infinite dilution lead to the shape of the polymer that can be modeled in terms of a worm-like chain with a contour length of 380 nm and a persistence length of 17.5 nm. SANS data taken at higher polymer concentration were evaluated by using the polymer reference interaction site model (PRISM). We find that the persistence length reduce from 17.5 nm at infinite dilution to 5.3 nm at the highest concentration (volume fraction 0.038). This is comparable with the decrease of the persistence length in semi-dilute concentration predicted theoretically for polyelectrolytes. This finding reveals a softening of stiffness of the polymer brushes caused by their mutual interaction. |
| Keywords: | Cylindrical polymer brushes Softening of polymers SANS DLS PRISM |
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