Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.47: Poster

Montag, 12. März 2018, 17:30–19:30, Poster A

Interactions among Spherical Polyelectrolyte Brushes in Concentrated Aqueous Solutions — •Yunwei Wang^1,2, Regine von Klitzing¹, and Xuhong Guo² — ¹Technische Universität Darmstadt,Darmstadt,Germany — ²East China University of Science and Technology,Shanghai,China

Interactions among annealed spherical polyelectrolyte brushes (SPB) in concentrated aqueous dispersion are studied by rheology measurements, small angle X-ray scattering (SAXS) and wide X-ray scattering (WAXS). The SPBs consist of a solid poly(styrene) core and a shell of poly(acrylic acid) (PAA). The effect of SPB concentration; pH; salt concentration have been explored. At 12 wt-%, SAXS spectra show a new peak which is assumed to be caused by overlapping polyelectrolyte chains. They are associated and form locally ordered structures which reflects the enhanced interactions among SPB. The locally ordered structures of brushes are proved by WAXS. For further validation of the interaction between the PAA chains and its influence on the emulsion rheological properties, the concentration of 12wt% brushes of the different pH and salt concentration were studied.