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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.47: Poster
Monday, March 12, 2018, 17:30–19:30, Poster A
Interactions among Spherical Polyelectrolyte Brushes in Concentrated Aqueous Solutions — •Yunwei Wang1,2, 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.