Authors Grosse, I. ; Petong, N.
Title Surfactant Layers on Polypropylene Surfaces
Date 10.12.2002
Number 10424
Abstract This work is an attempt to apply published literature findings on the structure of surfactant layers on solid substrates to commonly used polymers. First of all, a review of current knowledge on these surfactant layers is given. Most results were obtained at the solid/liquid interfaces of very smooth, clean solid substrates like mica or graphite. It is therefore difficult to apply these findings to surfactant-treated solids in everyday use, such as fibres or plastics. This is due to their different chemical and morphological structure and surface properties, both in the wet and dry state. In this work, thin, spin-coated layers of a polymer (polypropylene) serve as model surfaces, representing a compromise between a very smooth, clean surface and an industrial one. Studies were carried out to characterize the interactions of the cationic surfactant octadecyl trimethylammoniumbromide (ODTMAB) with polypropylene (PP) in the wet (solid/liquid interface) and dry (solid/gaseous interface) state. The results of different methods (atomic force microscopy, ATR FTIR spectroscopy, zeta potential) show significant changes in the surface properties of polypropylene in contact with surfactant solutions even at very low concentrations as compared with its surface properties in pure water. After drying, discrete particles are found on the surface, which are identified as clusters of the surfactant. In addition, a thin, continuous surfactant layer covers the whole substrate. The results can be used to interpret changes in the macroscopic surface properties of polymers resulting from surfactant treatment.
Publisher Tenside Surfactants Detergents
Citation Tenside Surfactants Detergents 39 (2002) 164-170

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