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Identifier 000439464
Title Rheological signatures and origin of dynamic arrest in macromolecular systems of complex architecture
Alternative Title Ρεολογικές υπογραφές και προέλευση δυναμικού περιορισμού σε μακρομοριακά συστήματα περίπλοκης αρχιτεκτονικής
Author Καλαφατάκης, Νικόλαος
Thesis advisor Βλασσόπουλος, Δημήτριος
Abstract This work examines some salient features of star polymers in the melt state, which make them unique hybrid materials interpolating between polymers and colloids. It is already known that their rich viscoelastic response depends on the two fundamental parameters, functionality (number of arms) and arm length. Stars with low functionality and entangled arms relax stress via arm retraction. As the functionality increases, a second slower relaxation process emerges and is assigned to colloidal hopping dynamics. Here, we focus on the behavior of stars with extreme functionalities and low molar mass (mainly unentangled) arms. In such situations, the slow process is characterized by an extended low-frequency plateau modulus which reflects the caged dynamics of jammed soft solid-like self-suspended nanoparticles. Additionally, the compact structure of such highly branched macromolecular objects displays layers of distinct segmental mobilities. By employing linear rheometry, calorimetric techniques and broadband dielectric spectroscopy (in collaboration) we unravel the above intriguing properties of these materials and therefore offer new design guidelines for core-shell nanoparticles and soft composites.
Language English
Subject Polymeric systems
Star- shaped polymers
Αρχιτεκτονική πολυμερών συστημάτων
Αστεροειδή πολυμερή
Issue date 2021-03-26
Collection   School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
  Type of Work
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