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Identifier 000433340
Title Dynamic and mechanical reinforcement in gels of synthetic and biological origin
Alternative Title Δυναμική και μηχανική ενίσχυση πηκτωμάτων συνθετικής και βιολογικής προέλευσης
Author Φουντά, Δήμητρα
Thesis advisor Βλασσόπουλος, Δημήτριος
Reviewer Fischer, Peter
Loppinet, Benoit
Abstract We investigate the dynamic and viscoelastic properties of associating polymers forming gels. Our study addresses two challenges, the detailed characterization of the associating moieties, and the understanding of the properties of the formed networks, especially in the context of mixtures where mechanical reinforcement represents the main target. To achieve our goals, and in view of potential applications, we use both synthetic and biological macromolecules. First, we examine the self-assembly mechanism of telechelic star polymers comprising diblock copolymers in selective solvents. They can be thought of as building blocks of responsive supramolecular materials. We study the effect of key parameters like they functionality (f) and fraction of the associating (solvophobic) groups on their self-organization mechanism and dynamics in dilute solution. Next we focus on improving the mechanical properties a mucus hydrogel formed by the mucin proteins derived from hagfish mucin vesicles by adding nanofillers or even a second network. We test different fillers and identify the consequences of interactions between the mucin matrix and fillers by means of linear and nonlinear (shear and capillary break-up extensional) rheological measurements. Hence, we manage to establish protocols for reinforcement. Our findings offer insights for linking the properties of these gels to their structure and for designing such soft composites with tunable rheological and mechanical properties.
Language English
Subject Light scattering
Σκέδαση φωτός
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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