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Title Τροποποίηση επιφανειακών ιδιοτήτων πολυμερικών φύλλων με χρήση νανοσύνθετων επιστρωμάτων
Author Χατζάκη Θάλεια-Μιχαέλα
Thesis advisor Ανασταστιάδης, Σπύρος
Χρυσοπούλου, Κυριακή
Abstract In recent years the development of hydrophobic and especially superhydrophobic surfaces has attracted considerable attention thanks to their numeral potential applications. One of their most interesting applications, is the development of selfcleaning and anti-fouling surfaces, which can find use in building materials and cultural heritage monuments for their outdoor protection, as well as in textiles for the development of self-cleaning products. The combination of low surface energy and hierarchical roughness can lead to a contact angle over 150°. Whereas when superhydrophobicity is combined with a small contact angle hysteresis, a surface can develop anti-dust properties and is considered to be self-cleaning. Further than hydrophobicity, these surfaces can exhibit oleophobicity in many organic solvents, as well. In the current work, we have studied the surface properties of flexible polymer films, on which a nanocomposite coating (polymer/inorganic) was deposited. In particular, Low Density Polyethylene (LDPE) polymer films were utilized, the surface of which had been modified by Corona Treatment, while the coating consisted of a low surface energy polymer (Silres BS 4004) and hydrophilic inorganic Silicon dioxide (SiO2) nanoparticles. Nanoparticles of three different sizes were utilized; more specifically their diameters were 14nm, 37nm, and 134nm. Initially, the LDPE films were coated with pure Silres BS 4004 using solutions of different concentration, so as to study its effect on the surface properties of the coated films. The concentration of the polymer that was found to have the optimum surface properties was used for the development of the nanocomposite coatings that contained SiO2 nanoparticles as well. In the latter case, the effect of the nanoparticle size as well as of their concentration on the surface properties of the coated polymer films was examined. The surface properties were evaluated via Contact Angle measurements, during which a water droplet was deposited on the surface of the coated films, to study their hydrophobicity, whereas various organic solvents like Glycerol, Ethylene Glycol and DMSO were utilized to examine their oleophobic behavior as well. Scanning Electron Microscopy was used to study the surface topography as well as the surface roughness to provide complementary information towards understanding our results. The raw materials (LDPE, Silres BS 4004) as well as the coatings that exhibited the optimum results were characterized, using Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) and UV-Vis spectrometry, in order to compare the initial thermal and optical properties of the LDPE film with those of the coated films.
Language Greek
Issue date 2021-03-26
Collection   School/Department--School of Sciences and Engineering--Department of Chemistry--Graduate theses
  Type of Work--Graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/3/2/c/metadata-dlib-1617260829-842806-13778.tkl Bookmark and Share
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