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Identifier 000448363
Title Rheology and fracture of dynamic polymeric networks
Alternative Title Ρεολογία και θραύση δυναμικών πολυμερικών δικτύων
Author Pyromali, Christina
Thesis advisor Βλασσόπουλος, Δημήτριος
Abstract In this dissertation we investigate experimentally the linear dynamics and nonlinear shear response of macromolecular networks with ultimate aim to understand the conditions for reinforcement, yielding and flow due to combined constraints of topology and attractive interactions, and eventually come up with design criteria for materials with improved properties. From established to novel model systems, we utilize linear oscillatory and nonlinear steady shear rheology, creep and TMA tube-based modeling in order to understand how architecture, topology, physical and chemical crosslinks influence the performance of networks. This thesis is divided into three main sections. The first discusses the relaxation mechanisms of simple topologically constrained entangled homopolymers with emphasis on stress relaxation upon cessation of steady shear flow. The second and third sections focus on the development of multi-responsive polymeric networks containing at least two distinct dynamic modes. In particular, the second part investigates the role of the macromolecular architecture and the number of physical bonds on the rheological properties of metal-ligand supramolecular networks. The last part addresses the effects of nanofiller internal microstructure, size and volume fraction on network reinforcement containing single chain nanoparticles.
Language English
Subject Dynamic networks
Issue date 2022-07-22
Collection   School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Doctoral theses
  Type of Work--Doctoral theses
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