Capuano, Guglielmo
(2011)
STRUCTURE AND DYNAMICS OF MODEL POLYMER NANOCOMPOSITES.
[Tesi di dottorato]
(Unpublished)
| Item Type: |
Tesi di dottorato
|
| Lingua: |
English |
| Title: |
STRUCTURE AND DYNAMICS OF MODEL POLYMER NANOCOMPOSITES |
| Creators: |
| Creators | Email |
|---|
| Capuano, Guglielmo | guglielmo.capuano@unina.it |
|
| Date: |
30 November 2011 |
| Number of Pages: |
103 |
| Institution: |
Università degli Studi di Napoli Federico II |
| Department: |
Ingegneria dei materiali e della produzione |
| Scuola di dottorato: |
Ingegneria industriale |
| Dottorato: |
Ingegneria dei materiali e delle strutture |
| Ciclo di dottorato: |
24 |
| Coordinatore del Corso di dottorato: |
| nome | email |
|---|
| Mensitieri, Giuseppe | mensitie@unina.it |
|
| Tutor: |
| nome | email |
|---|
| Acierno, Domenico | acierno@unina.it |
|
| Date: |
30 November 2011 |
| Number of Pages: |
103 |
| Uncontrolled Keywords: |
polymer nanocomposites, silica, rheology |
| Settori scientifico-disciplinari del MIUR: |
Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 - Scienza e tecnologia dei materiali |
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| Date Deposited: |
13 Dec 2011 11:20 |
| Last Modified: |
20 Dec 2015 02:00 |
| URI: |
http://www.fedoa.unina.it/id/eprint/8830 |
Abstract
We study the structure and linear viscoelasticity of interacting polymer-nanocomposites based on mixtures of polyethylene-oxide and fumed silica particles. The filler is dispersed within the polymer using different techniques which lead to different dispersion states. The analysis of the dynamic response of our systems, highlights the formation of a stress-bearing network above a critical volume fraction, Фc. Extending a two-phase model used to describe weakly interacting systems, we show that above Фc the melt-state elasticity of the composites arises from the independent contributions of a polymer-particle network and a viscous matrix. We also find that while Фc depends on the initial state of dispersion, the network elasticity scales with volume fraction following a universal power-law, with an exponent ν≈1.8. Such scaling law has been recently predicted for the stress-bearing mechanism governed by polymer-mediated interactions.
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