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Tesi etd-01172018-173050


Thesis type
Tesi di dottorato di ricerca
Author
GIUNTOLI, ANDREA
URN
etd-01172018-173050
Title
Elasticity and scalings in amorphous solids and thin polymer films
Settore scientifico disciplinare
FIS/03
Corso di studi
FISICA
Commissione
tutor Prof. Leporini, Dino
commissario Prof.ssa Chiofalo, Maria Luisa
commissario Napolitano, Simone
commissario Torre, Renato
commissario Sozzi, Marco
Parole chiave
  • glass transition
  • molecular dynamics
  • polymers
  • confined liquids
  • rheology
Data inizio appello
08/02/2018;
Consultabilità
completa
Riassunto analitico
MD simulations of supercooled polymeric liquids at the Coarse Grained resolution aim to find connections between the static and morphological properties of the system with its dynamics. <br>The investigation of meaningful correlations between the many space- and time-scales involved in the dynamics<br>of such systems can help us to understand more deeply the physics behind the glass transition.<br>This Thesis work tackles two main areas of current interest, namely the rheology of complex solids and the dynamics of confined liquids, by means of Coarse Grained Molecular Dynamics simulations.<br>It is found that the presence of polymer connectivity raises the elastic modulus G and the shear strength Ty of glassy and semicrystalline solids, but only the introduction of chain stiffness causes deviation from the atomic universal scaling between G and Ty.<br>A universal scaling related to the cage dynamics is also studied in confined liquids, concluding that beta-relaxations have a complex, non-local nature.
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