Please use this identifier to cite or link to this item:

TitleIn-process assessment of clay dispersion in PLA during melt compounding: Effects of screw speed and filler content
Author(s)Teixeira, P. F.
Covas, J. A.
Hilliou, L.
In-process monitoring
poly(lactic acid)
Issue dateJul-2020
JournalPolymer Degradation and Stability
CitationTeixeira, P. F., Covas, J. A., & Hilliou, L. (2020). In-process assessment of clay dispersion in PLA during melt compounding: Effects of screw speed and filler content. Polymer Degradation and Stability, 109190
Abstract(s)Shear viscosity, clay particle size and volume fraction are measured in-situ during the extrusion of PLA-clay nanocomposites. These in-process measurements are particularly adequate to assess the dispersion of fillers in thermo-mechanically sensitive systems, as the additional degradation associated with sample preparation for off-line characterization is readily avoided. Overall, results point towards the impact of PLA degradation on the clay dispersion mechanism. A better dispersion is reported for composites compounded with more clay. Clay-enhanced PLA degradation reduces the viscosity of the polymer matrix. Thus, melt intercalation is facilitated which favors clay swelling and subsequent exfoliation. Increasing the screw speed does not produce the larger hydrodynamic stresses necessary for improving clay dispersion. Viscous heating is more important at larger screw speeds. This thermally activates the diffusion of clay platelets in the more degraded PLA matrix, and enhances clay dispersion at early stages of the process. However, progressive clay re-agglomeration occurs along the extruder which results in larger volume fractions of bigger clay particles, eventually leading to PNC with larger shear viscosity as the screw speed is increased
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

Files in This Item:
File Description SizeFormat 
  Restricted access
1,69 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID