Logo JG-Universität MainzProf. Dr. Axel Müller


SFB 481 TP A12: Structure Formation and Phase Equilibria in Concentrated Solutions of Charged Starpolymers
From 07/2004 to 06/2010
Project leader: Matthias Ballauff, Axel H. E. Müller
The aim of the project is a thorough understanding of the phase behavior and dynamics of charged star polymers in aqueous solution. We have already proven experimentally some predictions of the theory, like the dependence of the osmotic pressure on the arm number or the contraction of stars in presence of multivalent counterions. By continuing our work we want to thoroughly investigate mainly cationic stars. To do so, parameters like star concentration, valency of counterions, temperature and the architecture of the stars (arm length and arm number) will be varied. Specific interactions between counterions and star polymers are of interest. Attractive interactions, which can be triggered by temperature changes, will play a role (in particular, LCST). All experimental findings shall be compared with results of MD simulation and analytical theory. The search for ordered structures in concentrated polyelectrolyte star solutions will continuously be a major topic. In addition we want to intensify the work regarding the manipulation of charged star polymers with help of external stimuli (e.g., light => „nanoblossoms“) and investigate their potential use in nanotechnology.

» Website of the project in SFB 481

List of publications of this Project

388. Borisov, O.V.; Zhulina, E.B.; Leermakers, F.A.M.; Ballauff, M.; Müller, A.H.E.: Conformations and Solution Properties of Star-Branched Polyelectrolytes, Adv. Polym. Sci. 241, 1 (2011) -- DOI: 10.1007/12_2010_104 -- Details
356. Xu, Y.; Plamper, F.A.; Ballauff, M.; Müller, A.H.E.: Polyelectrolyte Stars and Cylindrical Brushes, Adv. Polym. Sci. 228, 1 (2010) -- DOI: 10.1007/12_2009_24 -- Details
342. Plamper, F.A.; Xu, Y.; Yuan, J.; Ballauff, M.; Müller, A.H.E.: Polyelectrolyte stars and cylindrical brushes made by ATRP: New building blocks in nanotechnology in: New Smart Materials via Metal Mediated Macromolecular Engineering, E. Khosravi, Y. Yagci, Y. Savelyev, Eds., NATO Science for Peace and Security Series, Springer, Dordrecht, p. 17-36, ISBN 978-90-481-3276-8 (2009) -- Details
331. Kind, L.; Plamper, F.A.; Göbel, R.; Mantion, A.; Müller, A.H.E.; Pieles, U.; Taubert, A.; Meier, W.: Silsesquioxane/Polyamine Nanoparticle-Templated Formation of Star- Or Raspberry-Like Silica Nanoparticles, Langmuir 25, 7109 (2009) -- DOI: 10.1021/la900229n -- PDF -- Details
328. Yan, L.-T.; Xu, Y.; Ballauff, M.; Müller, A.H.E.; Böker, A.: Influence of Counterion Valency on the Conformational Behavior of Cylindrical Polyelectrolyte Brushes, J. Phys. Chem. B 113(15), 5104 (2009) -- DOI: 10.1021/jp810648z -- PDF -- Details
317. Xu, Y.; Bolisetty, S.; Ballauff, M.; Müller, A.H.E.: Switching the Morphologies of Cylindrical Polycation Brushes by Ionic and Supramolecular Inclusion Complexes, J. Am. Chem. Soc. 131(5), 1640 (2009) -- DOI: 10.1021/ja807302j -- PDF -- Details
314. Bolisetty, S.; Rosenfeldt, S.; Rochette, C.; Harnau, L.; Lindner, P.; Xu, Y.; Müller, A.H.E.; Ballauff, M.: Interaction of cylindrical polymer brushes in dilute and semi-dilute solution, Colloid Polym. Sci. 287, 129 (2009) -- DOI: 10.1007/s00396-008-1962-3 -- PDF -- Details
312. Xu, Y.; Bolisetty, S.; Drechsler, M.; Fang, B.; Yuan, J.; Harnau, L.; Ballauff, M.; Müller, A.H.E.: Manipulating cylindrical polyelectrolyte brushes on the nanoscale by counterions: collapse transition to helical structures, Soft Matter 5, 379 (2009) -- DOI: 10.1039/b812179f -- PDF -- Details
299. Xu, Y.; Bolisetty, S.; Drechsler, M.; Fang, B.; Yuan, J.; Ballauff, M.; Müller, A.H.E.: pH and Salt Responsive Poly(N,N-dimethylaminoethyl methacrylate) Cylindrical Brushes and their Quaternized Derivatives, Polymer 49, 3957–3964 (2008) -- DOI: 10.1016/j.polymer.2008.06.051 -- PDF -- Details
298. Pergushov, D.V.; Babin, I.A.; Plamper, F.A.; Zezin, A.B.; Müller, A.H.E.: Water-Soluble Complexes of Star-Shaped Poly(acrylic acid) With Quaternized Poly(4-vinylpyridine), Langmuir 24(13), 6414 (2008) -- DOI: 10.1021/la800959s -- PDF -- Details
287. Müller, A.H.E.; Plamper, F.A.; Schmalz, A.; Ballauff, M.: Tuning the thermoresponsiveness of weak polyelectrolytes by pH and light: lower and upper critical solution temperature of poly(N,N-dimethylaminoethyl methacrylate), Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.) 49(1), 1099 (2008)
275. Plamper, F.A.; Schmalz, A.; Ballauff, M.; Müller, A.H.E.: Tuning the Thermoresponsiveness of Weak Polyelectrolytes by pH and Light: Lower and Upper Critical Solution Temperature of Poly(N,N-dimethylaminoethyl methacrylate), J. Am. Chem. Soc. 129, 14538 (2007)
274. Plamper, F.A.; Ruppel, M.; Schmalz, A.; Borisov, O.V.; Ballauff, M.; Müller, A.H.E.: Tuning the Thermoresponsive Properties of Weak Polyelectrolytes: Aqueous Solutions of Star-Shaped and Linear Poly(N,N-dimethylaminoethyl methacrylate), Macromolecules 40, 8361 (2007) -- Details
271. Plamper, F.A.; Schmalz, A.; Penott-Chang, E.K.; Drechsler, M.; Jusufi, A; Ballauff, M.; Müller, A.H.E.: Synthesis and Characterization of Star-Shaped Poly(N,N-dimethylaminoethyl methacrylate) and Its Quaternized Ammonium Salts, Macromolecules 40, 5689 (2007) -- Details
259. Plamper, F.A.; Müller, A.H.E.; Ballauff, M.: Nanoblossoms: Photoinduced Stretching and Photoinduced Dissolution of Polycation Stars by Switching the Charge of Counterions, Polym. Mater. Sci. Eng. 96, 799 (2007)
251. Plamper, F.A.; Walther, A.; Müller, A.H.E.; Ballauff, M.: Nanoblossoms: Light-Induced Conformational Changes of Cationic Polyelectrolyte Stars in Presence of Multivalent Counterions, Nano Letters 7, 167 (2007) -- Details
232. Mori, H.; Müller, A.H.E.: Design of novel polymeric architectures with (meth)acrylic acid segments by controlled/living polymerizations in J. Jagur-Grodzinski, Ed.: Collective Volume on Living and Controlled Polymerization: Synthesis, Characterization and Properties of the Respective Polymers and Copolymers, Nova Science Publ., Happauge, N.Y., p. 257 (2006) -- Details
228. Plamper, F.A.; Becker, H.; Lanzendörfer, M.; Patel, M.; Wittemann, A.; Ballauff, M.; Müller, A.H.E.: Synthesis, Characterization and Aqueous Solution Behaviour of Star-shaped Poly(acrylic acid), Macromolecular Chemistry and Physics 206, 1813 (2005) -- Details
226. Ballauff, M.; Patel, M.; Rosenfeldt, S.; Dingenouts, N.; Narayanan, T.; Müller, A.H.E.; Plamper, F.A.: Analysis of the correlation of counterions to macroions by anomalous small-angle scattering, Polym. Mater. Sci. Eng. 93, 232 (2005)

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