Flow and mixing efficiency characterisation in a CO2-assisted single-screw extrusion process by residence time distribution using Raman spectroscopy
| Autor: | Elisabeth Rodier, Martial Sauceau, Audrey Common, Jacques Fages |
|---|---|
| Přispěvatelé: | Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement (RAPSODEE), Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT) |
| Rok vydání: | 2014 |
| Předmět: |
Hot-melt extrusion
Materials science General Chemical Engineering Raman spec- troscopy Plastics extrusion Analytical chemistry Mixing (process engineering) 02 engineering and technology 010402 general chemistry Static mixer 01 natural sciences law.invention [SPI]Engineering Sciences [physics] Supercritical carbon dioxide Blowing agent law [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering Composite material Porosity Melt flow index Residence time distribution General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Raman spectroscopy Extrusion 0210 nano-technology |
| Zdroj: | Chemical Engineering Research and Design Chemical Engineering Research and Design, Elsevier, 2014, 92 (7), p. 1210-1218. ⟨10.1016/j.cherd.2013.10.013⟩ |
| ISSN: | 0263-8762 |
| DOI: | 10.1016/j.cherd.2013.10.013 |
| Popis: | International audience; Hot-melt extrusion of a bio-sourced polyamide has been implemented in a single-screw extruder with supercritical carbon dioxide injection. CO2 acts as a plasticiser in the extruder barrel and as a physical blowing agent at the die. To insure a better mixing and dissolution of the CO2 into the polymer melt, addition of a static mixer between the screw tip and the die was tested. The effect of both the static mixing element and the CO2 injection on the melt flow behaviour has been elucidated. A recent technique of in-line Raman spectroscopy was implemented to make a residence time distribution study, using titanium dioxide as a tracer. The use of a static mixer exerts a major modification on the flow behaviour: it improves mixing by enhancing dispersion. In addition, the structure of the manufactured products was studied: the static mixer led to more homogeneous porous structure. The broad range of CO2 incorporation (up to 25%, w/w) into the melt led to the manufacture of foams with adjustable porosity from 15 to 70%. (C) 2013 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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