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Identifier	000432568
Title	An experimental investigation of phase transitions in polymer and associating polymer solutions
Alternative Title	Πειραματική μελέτη μεταβάσεων φάσης σε πολυμερικά και συσσωματούμενα διαλύματα
Author	Μουντιάνου, Αντρί
Thesis advisor	Βλασσόπουλος, Δημήτριος
Reviewer	Loppinet, Benoit Πετεκίδης, Γεώργιος
Abstract	We present a systematic investigation of the phase behavior of telechelic star polymers (TSPs), consisting of star block copolymers in a solvent selective for the inner block. By altering the temperature, it is possible to tune the properties (and phase) of the TSPs. We have utilized a series of well-characterized styrene(out)-b-butadiene(in), PS-b-PB, TSPs in phenyldodecane with cloud points of 53.5⁰C and 22⁰C for PS and PB, respectively. We have built a simple and robust turbidity setup and tested by constructing a phase diagram for PS homopolymer and comparing against literature, with support from Flory-Huggins modeling. Results on bimodal have been complemented by linear viscoelastic measurements which are sensitive to the phase changes due to the enhanced fluctuations in their neighborhood. The impact of the molecular weight, the fraction of each block (hence, degree of attraction) and the number of arms on the detected phase behavior (associated with the bimodal line) and dynamics has been identified. These findings serve as guidelines for selecting appropriate TSPs for given applications and for eventually developing designing rules for such systems and their phase behavior with the help of simulations.
Language	English
Subject	Πολυμερή αλλαγή φάσης
	Πολυμερικά διαλύματα
Issue date	2020-11-27
Collection	School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
	Type of Work--Post-graduate theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/e/6/5/metadata-dlib-1606131380-541219-7318.tkl
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