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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: RHEOLOGICA ACTA; v. 60, n. 4, p. 209-218, APR 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
• Beneficiário: Antonio Helio de Castro Neto
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC
• Processo FAPESP: 14/22840-3 - Transferência direta a seco de grafeno-CVD para substratos poliméricos bidimensionais e tridimensionais
• Beneficiário: Guilhermino José Macêdo Fechine
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/10910-8 - Fotodegradação e fotoestabilização de nanocompósitos poliméricos a base de cargas bidimensionais
• Beneficiário: Guilhermino José Macêdo Fechine
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/07244-3 - Nanocompósitos poliméricos baseados em grafeno para aplicação em comunicações ópticas
• Beneficiário: Leice Gonçalves Amurin
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/12400-1 - Preparação e caracterização de nanocompósitos de polipropileno/óxido de grafeno
• Beneficiário: Yuri Durighetto Coelho de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica