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Issue 23, 2009
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Gelled polymerizable microemulsions. Part 3 Rheology

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Abstract

This is the first report on the rheological properties of oil-gelled polymerizable bicontinuous microemulsions. The polymerizable base system consists of H2O/NIPAm/BisAm – n-dodecane – C13/15E5 (a technical grade n-alkyl polyglycol ether), where NIPAm denotes the monomer N-isopropylacrylamide and BisAm the cross-linker N,N′-methylene bisacrylamide. For the planned polymerization of the aqueous phase a scaffold is needed to preserve the structure of the templating microemulsion during the polymerization. This scaffold is supposed to be a gel, which was formed by adding the gelator 12-hydroxyoctadecanoic acid (12-HOA) to the oil phase of the microemulsion. The influence of the water-to-oil ratio α, of the gelator concentration β, and of the monomer concentration ψ on the rheological behavior of gelled microemulsions has been studied in detail. The most important result of the study at hand is the observation of a transition from a high viscous solution to a gel, i.e. from a transient to a permanent network, with increasing gelator concentration and increasing amount of the oil phase. In other words, it is only under well-defined conditions that an oil-gelled microemulsion is formed.

Graphical abstract: Gelled polymerizable microemulsions. Part 3 Rheology

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Article information


Submitted
16 Jul 2009
Accepted
27 Aug 2009
First published
24 Sep 2009

Soft Matter, 2009,5, 4763-4772
Article type
Paper

Gelled polymerizable microemulsions. Part 3 Rheology

M. Magno, R. Tessendorf, B. Medronho, M. G. Miguel and C. Stubenrauch, Soft Matter, 2009, 5, 4763
DOI: 10.1039/B914281A

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