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Identifier 000282909
Title Μικυλλιοποίηση σε μίγματα συμπολυμερών/ομοπολυμερών : επίδραση της αρχιτεκτονικής και της σύστασης
Alternative Title Micellization in copolymer/homopolymer blends
Author Καραγιάννη, Κωνσταντίνα Σωκράτη
Thesis advisor Αναστασιάδης, Σπυρίδων
Abstract Micellization in block copolymer/homopolymer blends is investigated via Dynamic Light Scattering and Rheology. The study is performed as a function of the block copolymer composition, architecture and its concentration in the homopolymer matrix. The effect of the total polymer concentration in a non-selective solvent is examined as well. Three (polyisoprene)2(polystyrene), I2S, graft copolymers with similar molecular weights but different compositions are utilized in matrix, PI, that is chemically identical to one of the copolymer blocks and the results are discussed in relation to the behavior of linear polyisoprene-polystyrene diblock copolymers, in polyisoprene, in solution and in the bulk. Micellization of the graft copolymer in the homopolymer matrix is observed for the sample with the highest PS number fraction (fPS=0.64) in all copolymer and total polymer concentrations. In contrast, the copolymer/homopolymer blend containing the graft copolymer that is poor in polystyrene (fPS= 0.09) indicates no micelle formation. Moreover, on the other hand, blends containing the graft copolymer with intermediate PS content (fPS=0.32) exhibit micelle formation depending on the polymer concentration in solution. The linear diblock copolymers, exhibit similar behavior with the respective graft ones. The copolymer/homopolymer blends containing the rich in polystyrene linear diblock copolymer show micelle formation in all concentrations, whereas the one with intermediate PS content contains micelles only in high polymer concentrations. However, the linear and graft copolymer systems differ on the size of the micelles that they form. Results from Rheology show no influence on the rheological response of the samples, independently of the presence or absence either of the copolymer chains or of the micelles. The results are discussed in relation to theoretical predictions and results from former works.
Language Greek
Subject Diblock copolymers
Dynamic Light Scattering
Graft copolymers
Polymeric blends
Polymeric solutions
Δυναμική Σκέδαση Φωτός
Δυσυσταδικά συμπολυμερή
Εμβολιασμένα συμπολυμερή
Πολυμερικά διαλύματα
Πολυμερικά τήγματα
Issue date 2005-12-01
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Chemistry--Post-graduate theses
  Type of Work--Post-graduate theses
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