|361. Xu, Y.; Borisov, O.V.; Ballauff, M.; Müller, A.H.E.: Manipulating the Morphologies of Cylindrical Polyelectrolyte Brushes by Forming Interpolyelectrolyte Complexes with Oppositely Charged Linear Polyelectrolytes: An AFM Study, Langmuir 26(10), 6919 (2010) -- DOI: 10.1021/la904167r|
We present a study on water-soluble interpolyelectrolyte complexes (IPECs) formed by cationic cylindrical polyelectrolyte brushes (CPBs) and linear anionic poly(sodium styrenesulfonate) (PSSNa) using atomic force microscopy (AFM). The IPECs were prepared by dialysis of salt-containing solutions of the two polymeric components. The morphologies of the IPECs could be tuned by changing the charge ratio between the two polyelectrolytes, Z−/+. Addition of increasing numbers of short PSSNa chains induced morphology changes of host CPBs from worms through intermediate pearl-necklace structures to fully collapsed spheres. Extremely long guest PSSNa caused the full collapse of the brushes to spheres even at very low charge ratios without intermediate states. In both cases we observe disproportionation, that is, inhomogeneous distribution of the PSS chains between the CPB for Z−/+ < 1. Unexpected micrometer-scale core−shell cylindrical objects were found by directly mixing CPBs with long PSSNa, which might be nonequilibrium structures caused by the kinetically controlled IPEC formation.
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- Projekt: DFG MU896/22: Templatgestützte Synthese von anorganischen Nanodrähten in amphiphilen, zylindrischen Kern-Schale-Polymerbürsten
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