Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/7254
Título: Gelled polymerizable microemulsions. Part 3 Rheology
Autor: Magno, M.
Tessendorf, R.
Medronho, B.
Miguel, M. G.
Stubenrauch, C.
Data: 2009
Editora: Royal Society Chemistry
Resumo: 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 alpha, of the gelator concentration beta, and of the monomer concentration psi 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.
Peer review: yes
URI: http://hdl.handle.net/10400.1/7254
DOI: https://dx.doi.org/10.1039/b914281a
ISSN: 1744-683X
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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