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Title Effects of humidity on the dynamics of Supramolecular Polymer solutions
Author Αθανασάκη, Αντωνία
Reviewer Βλασσόπουλος, Δημήτριος
Abstract In this thesis we investigated experimentally the consequences of relative humidity and temperature on the linear and especially, nonlinear viscoelasticity of a well-entangled hydrogen-bonded supramolecular polymer solution in an apolar solvent. We used a hydrogen bonding motif 2,4-bis(2-ethylhexylureido)toluene (EHUT), which self-assembles in dodecane, forming supramolecular structures (tubes or filaments). The problem we addressed is the interplay of water molecules (which dissolve at minute amounts in dodecane) and the dynamics of the supramolecular polymers (we focused on tube structures). For this reason, we utilized a specific repeated shear stress startup/relaxation protocol and analyzed the characteristic time for loss of topological constraints/junctions at steady state as a function of the applied constant shear rate, the sequence of test and the level of relative humidity. We compared our findings with those obtained with a conventional synthetic solution. Our results point to the role of break/association time of EHUT on the nonlinear dynamics at different external conditions and provide a new way to distinguish the behaviors of physically-bonded supramolecular and covalently-bonded polymers.
Language Greek
Issue date 2022
Collection   School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Graduate theses
  Type of Work--Graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/2/9/5/metadata-dlib-1662108596-605615-15639.tkl Bookmark and Share
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