The effect of microcellular structure on the dynamic mechanical thermal properties of high-performance nanocomposite foams made of graphene nanoplatelets-filled polysulfone
| Autor: | Hooman Abbasi, José Ignacio Velasco, Marcelo Antunes |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. Doctorat en Ciència i Enginyeria dels Materials, Universitat Politècnica de Catalunya. POLY2 - Polyfunctional polymeric materials |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Grafè foams polysulfone Enginyeria dels materials [Àrees temàtiques de la UPC] Article lcsh:QD241-441 chemistry.chemical_compound Multifunctional lcsh:Organic chemistry Nanocompòsits (Materials) Escuma (Química) viscoelastic behavior Thermal Viscoelastic behavior Relative density Thermoplastics Polysulfone Composite material Dissolution multifunctional Nanocomposites (Materials) Nanocomposite graphene nanoplatelets Termoplàstics Foams General Chemistry Dynamic mechanical analysis Foamed materials Foam Supercritical fluid Graphene nanoplatelets chemistry Graphene Glass transition Materials escumosos |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Polymers Volume 13 Issue 3 Polymers, Vol 13, Iss 437, p 437 (2021) |
| DOI: | 10.3390/polym13030437 |
| Popis: | Polysulfone nanocomposite foams containing variable amounts of graphene nanoplatelets (0&ndash 10 wt%) were prepared by water vapor-induced phase separation (WVIPS) and supercritical CO2 (scCO2) dissolution. WVIPS foams with two ranges of relative densities were considered, namely, between 0.23 and 0.41 and between 0.34 and 0.46. Foams prepared by scCO2 dissolution (0.0&ndash 2.0 wt% GnP) were obtained with a relative density range between 0.35 and 0.45. Although the addition of GnP affected the cellular structure of all foams, they had a bigger influence in WVIPS foams. The storage modulus increased for all foams with increasing relative density and GnP&rsquo s concentration, except for WVIPS PSU-GnP foams, as they developed open/interconnected cellular structures during foaming. Comparatively, foams prepared by scCO2 dissolution showed higher specific storage moduli than similar WVIPS foams (same relative density and GnP content), explained by the microcellular structure of scCO2 foams. As a result of the plasticizing effect of CO2, PSU foams prepared by scCO2 showed lower glass transition temperatures than WVIPS foams, with the two series of these foams displaying decreasing values with incrementing the amount of GnP. |
| Databáze: | OpenAIRE |
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