Influence of Ionene Polyelectrolytes on Rheology and Photorheology of Aqueous Micellar Cetyltrimethylammonium Bromide Containing 9-Anthracene Carboxylic Acid
✍ Scribed by Jens Frömmel; Thomas Wolff
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 175 KB
- Volume
- 201
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
Polyelectrolytes of the structure given in Scheme 2 are Solubilization of 9-anthracene carboxylic acid (9-AC) in aqueous called ionenes. In this study [3,12]-and [3,16]-ionene were solutions of [3,12]-ionene and [3,16]-ionene (with bromide counterused. In water the former tends to assume a linear or barely ions) generates hydrobromic acid, as revealed by decreasing pH valfolded structure, while the latter is capable of forming spheriues. Photodimerization of solubilized 9-AC reverts this effect. Newtoncal micelles (5). Ionenes are known to resemble micellar ian flow is observed in solutions of ionenes and 9-AC throughout. properties to some extent. In particular the solubilization In contrast, aqueous solutions of cetyltrimethylammonium bromide behavior of CTAB is paralleled in part by [3,16]-ionene (5, containing 9-AC exhibit viscoelasticity. The flow behavior of such 6). We were therefore curious about (i) the influence that solutions was studied in the presence of various amounts of [3,16]the presence of ionenes can have on the rheology and photoionene. The addition of ionenes, as well as the photodimerization of 9-anthracene carboxylic acid, reduced viscoelastic features. A shorten-rheology of aqueous CTAB solutions containing 9-AC, and ing of worm-like micelles is likely to be the molecular origin of the (ii) the influence of 9-AC addition on the viscosity of aqueobserved effect. Rheological analysis revealed up to four relaxation ous ionene solutions. processes in sheared viscoelastic systems.