6533b7d0fe1ef96bd125a178

RESEARCH PRODUCT

Apparent Molar Mass of a Polyelectrolyte in an Organic Solvent in the Low Ionic Strength Limit As Revealed by Light Scattering

Manfred SchmidtS. SahaMurugappan MuthukumarKarl Fischer

subject

Molar massPolymers and PlasticsScatteringChemistryOrganic ChemistryInorganic chemistryAnalytical chemistryApparent molar propertyLight scatteringPolyelectrolyteInorganic ChemistryAbsolute molar massIonic strengthMaterials ChemistryMolar mass distribution

description

The apparent molar mass of a partially quaternized poly-2-vinylpyridines (degree of quaternization 4.3% < Q < 35%) in 1-propanol is measured by light scattering at low ionic strength (10–6 M < cs < 10–3 M) as a function of polyion repeat unit concentration (7 × 10–5 monomol/L < cm,p < 4 × 10–2 monomol/L). No dialysis was applied prior to measurements. The apparent molar mass under “salt-free” conditions is smaller than the true molar mass by an order of magnitude, while approaching the true value at higher ionic strength. Concomitant data on the dependence of scattering intensity on scattering wave vector show that the dilute polyelectrolyte solutions are strongly correlated. A recent theory by Muthukumar for light scattering of dilute polyelectrolyte solutions, developed for correlated multicomponent systems, accounts for interchain electrostatic correlations and regularization of polymer charge by counterion binding isotherm. The experimental results on the relation between the apparent and true molar m...

yearjournalcountryeditionlanguage
2013-10-10Macromolecules
https://doi.org/10.1021/ma4006268