Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 11: POSTER Disperse Polymer Systems

CPP 11.31: Poster

Dienstag, 28. März 2006, 17:00–19:00, P3

Self assembly in mixtures of surfactant and amphiphilic Poly(p-phenylenes): Rodlike structures — •Thomas Hellweg¹, Tobias Fütterer¹, Gerhard Findenegg¹, and Dieter Schlüter² — ¹TU Berlin, Stranski-Lab. (ER 1), Strasse des 17.Juni 112, 10623 Berlin — ²ETH Zürich

2,5-disubstituted poly(p-phenylenes) with one nonpolar substituent R1 and one polar substituent R2 on each monomeric unit represent an interesting class of amphiphiles in which the border between the hydrophilic and hydrophobic part of the molecule runs along its stiff backbone. We have studied the self-assembly of a poly(p-phenylene) oligomer, PP_n (n=12), with substituents R1= C₁₂H₂₅ and R2=-CH₂(OC₂H₄)₃OCH₃ in the pure state and in aqueous surfactant solutions, using light scattering, and SANS. This compound is soluble in aqueous solutions of nonionic surfactants such as e.g. C₈E₄, where it forms elongated stiff aggregates (contour length ca. 500 nm, diameter 5.5 nm). The ratio polymer to surfactant was found to be 1:3 in the mixed structures using SANS [1]. Dynamic light scattering data from the aqueous PP₁₂-C₈E₄ solution can be modelled by an intermediate scattering function for rod-like particle dynamics [2].

[1] T. Fütterer, Th. Hellweg, G. H. Findenegg, J. Frahn, and A. D. Schlüter; Macromolecules 38 (2005) 7451.

[2] T. Fütterer, Th. Hellweg and G. H. Findenegg; in: Mesoscale Phenomena in Fluid Systems, F. Case and P. Alexandridis (Hrsg.), ACS Symposium Series No. 861,(2003).