Correlation between the polymerization kinetics and the chemical structure of poly(urethane-urea) nanocapsule membrane obtained by interfacial step polymerization in miniemulsion

International audienceKinetics of the interfacialsteppolymerization in direct miniemulsion between 1,6-hexanediol and isophorone diisocyanate, at different temperatures and with different organic solvents as dispersed phase was investigated. Despite the complexity of the reaction system due to the specific experimental conditions, the profiles of consumption of the isocyanate groups and diisocyanate monomer, and the chemicalstructure of the being formed polymer membrane, were concurrently determined by gas chromatography, FTIR spectroscopy, 13C NMR and MALDI-TOF mass spectrometry. The results were connected with the key-steps of the membrane formation by interfacialpolymerization, pointing out the prevailing influence of the organic dispersed phase on the hydrophilic monomer diffusion and the swelling rate of the polymeric membrane