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Siegel der Universität
Department für Chemie - Arbeitsgruppe Prof. Strey

Charakterisierung, Modellierung und Polymerisation von Mikroemulsionen aus Alkylmethacrylaten

Oliver Lade, May 2001

In this work a systematic study on the polymerization of alkylmethacrylates in microemulsions is introduced. As surfactants the nonionic n-alkylpolyethyleneglycolether and the ionic surfactants sodium bis-(2-ethylhexyl) sulfosuccinate (AOT) and sodium dodecylsulfate were applied. First an in depth characterization of the starting microemulsions with respect to phase behavior and microstructure was carried out. The polymerizable microemulsions exhibit the same general patterns as the previously extensively studied model microemulsions. In this work these patterns will be explained by a new phenomenological bending elasticity model. An important prerequisite for the explanation of the polymerization mechanism is the determination of the reaction kinetics and the characterization of the resulting polymer. As far as nonionic polymerizable microemulsions consisting of hexylmethacrylate are concerned, the quantitative description of the reaction kinetics is done by a straight forward model. It shows, that the surfactants from ethoxylated alcohols interfere with the polymerization process as radical transmitter. Colloidal stable polymerlaxes are being formed with particle sizes in the nm region and molecular weights of about 103 kg/mol. The polymerization mechanism of anionic microemulsions differs from the from the simple behavior of the nonionics depending on specific phase behavior characteristics. Stable latex particles with very long chains, however, are being formed whereas the macroscopic properties of the latex solution are determined more by the continous phase than by the polymer.