The pressure dependence of viscosity of two nanocomposites with a polystyrene (PS) matrix that contains, respectively, multiwalled carbon nanotubes (MWCNTs) and graphene, was investigated. Two procedures were used: (a) Pressure-volume-temperature (PVT) results to obtain the pressure coefficient β0 for Newtonian viscosity and (b) measurements in a pressure chamber in a capillary rheometer, to obtain the pressure coefficient at constant shear rate, β′ and the pressure coefficient at constant shear stress, β″. PVT results revealed that the most significant differences between the samples concerned the variation of the glass transition with pressure, dTg/dP, which was concomitant with the number of polymer chains fixed on the surface of the nanofillers. Pressure chamber results showed that the pressure coefficient β″ was similar for PS and the nanocomposites, at the shear rates involved in processing. For the first time, the piezorheological complexity of nanocomposites was analyzed, together with the thermorheological complexity. PS/MWCNT nanocomposite was thermorheologically complex in the linear viscoelastic regime, but thermorheologically and piezorheologically simple in the shear thinning flow region. Nevertheless, PS/graphene nanocomposite was thermorheologically and piezorheologically complex in the linear viscoelastic regime and the shear thinning regime. This was due to the high capacity of graphene 2D platelets to retain polymer chains anchored to its surface.
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November 2016
Research Article|
November 01 2016
The effect of pressure on the viscosity of two different nanocomposites based on a PS matrix: A case of piezorheological complexity
Estibaliz Rodriguez;
Estibaliz Rodriguez
Polymer Science and Technology Department and Institute of Polymer Materials, POLYMAT, Faculty of Chemistry,
University of the Basque Country
, P.O. Box 1072, 20080 San Sebastian, Spain
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Mercedes Fernandez;
Mercedes Fernandez
Polymer Science and Technology Department and Institute of Polymer Materials, POLYMAT, Faculty of Chemistry,
University of the Basque Country
, P.O. Box 1072, 20080 San Sebastian, Spain
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Maria Eugenia Muñoz;
Maria Eugenia Muñoz
Polymer Science and Technology Department and Institute of Polymer Materials, POLYMAT, Faculty of Chemistry,
University of the Basque Country
, P.O. Box 1072, 20080 San Sebastian, Spain
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Antxon Santamaria
Antxon Santamaria
a)
Polymer Science and Technology Department and Institute of Polymer Materials, POLYMAT, Faculty of Chemistry,
University of the Basque Country
, P.O. Box 1072, 20080 San Sebastian, Spain
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a)
Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Rheol. 60, 1199–1210 (2016)
Article history
Received:
February 08 2016
Accepted:
August 22 2016
Citation
Estibaliz Rodriguez, Mercedes Fernandez, Maria Eugenia Muñoz, Antxon Santamaria; The effect of pressure on the viscosity of two different nanocomposites based on a PS matrix: A case of piezorheological complexity. J. Rheol. 1 November 2016; 60 (6): 1199–1210. https://doi.org/10.1122/1.4963814
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