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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   Faculty/Department--Faculty of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
  Type of Work--Post-graduate theses
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