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TitleDispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions
Author(s)Vilaverde, C.
Santos, R. M.
Paiva, M. C.
Covas, J. A.
Electrical properties
Optical microscopy
A. Nanocomposites
B. Electrical properties
D. Optical microscopy
E. Extrusion
Issue dateAug-2015
JournalComposites Part A: Applied Science and Manufacturing
CitationVilaverde, C., Santos, R. M., Paiva, M. C., & Covas, J. A. (2015). Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions. Composites Part A: Applied Science and Manufacturing, 78, 143-151. doi: 10.1016/j.compositesa.2015.08.010
Abstract(s)The kinetics of GnP dispersion in polypropylene melt was studied using a prototype small scale modular extensional mixer. Its modular nature enabled the sequential application of a mixing step, melt relaxation, and a second mixing step. The latter could reproduce the flow conditions on the first mixing step, or generate milder flow conditions. The effect of these sequences of flow constraints upon GnP dispersion along the mixer length was studied for composites with 2 and 10 wt.% GnP. The samples collected along the first mixing zone showed a gradual decrease of number and size of GnP agglomerates, at a rate that was independent of the flow conditions imposed to the melt, but dependent on composition. The relaxation zone induced GnP re-agglomeration, and the application of a second mixing step caused variable dispersion results that were largely dependent on the hydrodynamic stresses generated.
AccessOpen access
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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