Polyoxyalkylated diethylenetriamine polymeric surfactants: molecular structure effect on thin wetting films.
In: Colloid & Polymer Science, Jg. 291 (2013-12-01), Heft 12, S. 2965-2974
Online
academicJournal
Zugriff:
Thin wetting films from aqueous solution of four polyoxyalkylated diethylenetriamine (DETA) polymeric surfactants (named A, B, C, and D) are studied. Surfactants A, B, and C have a star-like structure differing only by the number of polymeric branches: four, six, and nine in the mentioned order while the forth one, D, is of a dendritic type with four to six primary and two to three secondary branches. The receding contact angles θr of the solution on hydrophilic SiO 2 glass surface and the contact angle θaq of a drop of doubly distilled water on SiO 2 glass surface pretreated with DETA polymeric surfactant solution are measured. The θr values on hydrophobicity of SiO 2 glass surface, respectively, increase in the following order: surfactant A, surfactant C, surfactant B, and surfactant D. The equilibrium thickness heq of wetting films from DETA aqueous solution on hydrophilic SiO 2 glass surface is measured using the micro-interferometric method. Results show an unexpected course of the heq vs. Cs curves with a maximum. Results from the studies indicate that differences in polymeric surfactant molecular structure affect the properties exhibited at air/liquid and solid/liquid interfaces, such as the value of surface tension, degree of hydrophobicity of solid surface, equilibrium film thickness, etc. [ABSTRACT FROM AUTHOR]
Titel: |
Polyoxyalkylated diethylenetriamine polymeric surfactants: molecular structure effect on thin wetting films.
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Autor/in / Beteiligte Person: | Alexandrova, L. ; Petkova, H. ; Khristov, Khr. ; Grigorov, L. |
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Zeitschrift: | Colloid & Polymer Science, Jg. 291 (2013-12-01), Heft 12, S. 2965-2974 |
Veröffentlichung: | 2013 |
Medientyp: | academicJournal |
ISSN: | 0303-402X (print) |
DOI: | 10.1007/s00396-013-3045-3 |
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