%0 journal article
%@ 0032-3861
%A Karimi, M.,Albrecht, W.,Heuchel, M.,Weigel, T.,Lendlein, A.

%D 2008
%J Polymer
%N 10
%P 2587-2594 
%R doi:10.1016/j.polymer.2008.03.036
%T Determination of solvent/polymer interaction parameters of moderately concentrated polymer solutions by vapor pressure osmometry
%U https://doi.org/10.1016/j.polymer.2008.03.036
10 
%X The paper describes the application of vapor pressure osmometry (VPO) to determine solvent/polymer interaction parameters for various polymer solutions containing high-molecular weight polymers in the semi-diluted concentration range. The theoretical basis for the data evaluation is the Flory–Huggins (FH) model and a virial expansion up to the third virial term. For validation already well characterized polymer/solvent systems poly(vinylpyrrolidone)/water, polysulfone/N,N-dimethylformamide (DMF), and poly(ether sulfone)/DMF were investigated. In the second part interaction parameters of poly(ether imide) (PEI) in solvents with technical relevance for membrane formation (DMF, N-methylpyrrolidone (NMP), N,N-dimethylacetamide (DMAc)) were examined at different concentrations and temperatures. The results document that VPO is a fast and promising method for characterization of semi-diluted polymer solutions containing polymers with higher molecular weight. Results confirm the decrease of solvent power for PEI in the series: NMP > DMAc > DMF.