Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session 2

CPP 37.30: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P3

Monitoring the Kinetics of Interfacial Polymerizations using Microfluidics — •Ingmar Polenz, Quentin Brosseau, and Jean-Christophe Baret — Am Fassberg 17, 37077 Goettingen

Interfacial polymerization (IFP) techniques known since the 1960s offer a facile route for the rapid production of solid shells along emulsion droplets for the encapsulation of both hydrophilic and hydrophobic ingredients under mild conditions. However, due to the high particle size range gained at common IFP processes still there is a lack of reliable quantitative information on the polymerization kinetics and understanding the governing mechanisms that affect the shell formation and thus the capsule properties.

We use microfluidic PDMS devices for monitoring interfacial polymerization process at emulsion droplets by measuring the interfacial deformation which is induced by a hydrodynamic shear stress caused by consecutively arranged construction chambers. This method allows us to measure the microencapsulation fast-kinetics and precisely compare the reactivity of certain components at the IFP. We study the formation of polyurea microcapsules (PUMCs); shell formation occurs at the oil-water interface by an immediate reaction of amines, dissolved in the aqueous phase, and isocyanates that are dissolved in the oily phase. We find that at the initial shell formation both monomers of this IFP contribute equally to the overall encapsulation rate. We also quantify the retarding effect of surfactants on the encapsulation kinetics. The observations clearly indicate our monitoring device to be a powerful tool for the study of interfacial polymerization kinetics.