Graphene oxide dispersion state in polystyrene-based composites below percolation threshold via linear melt rheology

Author(s)

Dessi, Claudia ^[1] ; Amurin, Leice G. ^{[2, 3]} ; Munoz, Pablo A. R. ^[1] ; de Oliveira, Yuri D. C. ^[1] ; Fechine, Guilhermino J. M. ^[1] ; Andrade, Ricardo J. E. ^[1]

Affiliation

^[1] Georgetown Univ, Dept Phys, 3700 O St NW, Washington, DC 20057 - USA

^[2] Inst Presbiteriano Mackenzie SP, Mackgraphe Mackenzie Inst Res Graphene & Nanotech, Rua Consolacao 896, BR-01302907 Sao Paulo, SP - Brazil

^[3] Fed Univ Minas Gerais UFMG, Ctr Technol Nanomat CTNano, Belo Horizonte, MG - Brazil

• Document type: Journal article
• Source: RHEOLOGICA ACTA; v. 60, n. 4, p. 209-218, APR 2021.
• Web of Science Citations: 0

Abstract

In this work, the relation between the morphological structure and the linear viscoelasticity of graphene oxide (GO)-based polystyrene nanocomposites below percolation threshold was investigated. The rheological properties were observed to change upon addition of GO-2D particles at filler content below mechanical percolation threshold (0.06-0.3 %vol). In particular, the nanocomposite systems showed a delayed long-range relaxation dynamic regardless particle concentration, when compared to the neat polystyrene matrix. Moreover, little shift with regard to higher relaxation times of the full relaxation spectra of PS-GO nanocomposite was observed. This is attributed to the presence of attractive-kind interfacial interaction between polymer chains and GO-2D particles via pi-pi binding of benzyl rings, which strongly depends on GO sheets dispersion and exfoliation state. In light of these observations, oscillatory shear rheology measurements were used as an indirect tool to establish how exfoliated GO-2D particles were homogeneously dispersed in a low-polar polymer matrix. (AU)

• FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
• Grantee: Antonio Helio de Castro Neto
• Support Opportunities: Research Projects - SPEC Program
• FAPESP's process: 14/22840-3 - Direct dry transfer of CVD graphene to 2D and 3D polymeric substrates
• Grantee: Guilhermino José Macêdo Fechine
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/10910-8 - Photodegradation and photostabilization of polymer nanocomposites based on two-dimensional fillers
• Grantee: Guilhermino José Macêdo Fechine
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/07244-3 - Graphene-based polymer nanocomposites for application in optical communications
• Grantee: Leice Gonçalves Amurin
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 16/12400-1 - Manufacturing and characterization of polypropylene/graphene oxide nanocomposites
• Grantee: Yuri Durighetto Coelho de Oliveira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation