Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions


Autoria(s): Vilaverde, C.; Santos, R. M.; Paiva, M. C.; Covas, J. A.
Data(s)

01/08/2015

Resumo

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.

Project Matepro – Optimizing Materials and Processes (NORTE-07-0124-FEDER-000037) by Programam Operacional Regional do Norte (ON.2)

Identificador

Vilaverde, 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

1359-835X

http://hdl.handle.net/1822/38358

10.1016/j.compositesa.2015.08.010

Idioma(s)

eng

Publicador

Elsevier

Direitos

info:eu-repo/semantics/openAccess

Palavras-Chave #Nanocomposites #Electrical properties
Tipo

info:eu-repo/semantics/article