Poly(allylamine) aqueous solution was neutralized with solution of several inorganic acids and osmotic coefficients as well as apparent molar volumes of obtained salts were measured at 25 °C as a function of solute concentration (c). In the case of chloride, bromide, and nitrate counterions the obtained osmotic coefficients are almost equal and the differences among them are of order of the experimental error. The measured osmotic coefficients have values that are typical for vinylic polyelectrolyte solutions without added salt. At the same time these results are close to the value predicted by the Manning’s limiting law.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 36864261Conjugated polyelectrolytes are, due to their potential use in different optoelectronic devices and sensors, subject of the intense research . Poly(thiophen-3-ylacetic acid) (PTAA) is a promising polymer of this class, however, despite of numerous prospective applications little is known about its fundamental properties in solutions. The changes of UV/vis spectra of aqueous solutions of PTAA alkali salts were monitored. For aqueous alkali salt solutions of PTAA, changes of UV/Vis spectra with time were noticed. Some of these spectra evolutions resemble those attributed to conformational changes observed during PTAA neutralizations. Osmotic coefficients, apparent molar volumes, heats of dilution, molar conductivities, and transference numbers were determined for “aged” aqueous alkali salts solutions at 25 °C. Results indicate that alkali salts (Li, Na, and Cs) of PTAA behave similarly as other relatively low-molecular-weight polyelectrolytes. In addition, some ion specific effects, deserving more detailed studies, were observed.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 36864005By the systematic measurements of the heat effects upon dilution and mixing of x,y-ionenes of different hydrophobicity with simple electrolytes we discovered that hydrophobicity of the ionene qualitatively and quantitatively influences the ion-polyion interaction. The ordering in the Hofmeister series may change in such situations.
B.05 Guest lecturer at an institute/university
COBISS.SI-ID: 1681967