Crystallization kinetics, structure, and rheological behavior of poly(ethylene terephthalate)/multilayer graphene oxide nanocomposites

Autor(es)

Pinto, Gabriel M. ^{[1, 2]} ; Silva, Giovanna da C. ^[1] ; Santillo, Chiara ^[3] ; Lavorgna, Marino ^[3] ; Maia, Joao M. ^[2] ; Fechine, Guilhermino J. M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Prebiteriana Mackenzie, Mackenzie Inst Res Graphene & Nanotechnol MackGra, Rua Consolacao 896, BR-01302907 Sao Paulo, SP - Brazil

^[2] Case Western Reserve Univ, Dept Macromol Sci & Engn, 2100 Adelbert Rd, Cleveland, OH 44106 - USA

^[3] CNR, Inst Polymers Composites & Biomat, Naples - Italy

• Tipo de documento: Artigo Científico
• Fonte: POLYMER ENGINEERING AND SCIENCE; v. 60, n. 11 AUG 2020.
• Citações Web of Science: 0

Resumo

This work aims to produce poly(ethylene terephthalate)/multilayer graphene oxide (mGO) nanocomposites via continuous melt mixing in twin-screw extrusion, and to study the changes in crystallization and melt flow behavior. Three mGO contents (0.05, 0.1, and 0.3 wt%) were used. Differential scanning calorimetry analyses showed that at 0.1 wt%, mGO acted best as nucleating agent, increasing the crystallization kinetics as well as the melt crystallization temperature (T-mc) by more than 20%. It was also observed that mGO increases the crystals perfection. The nucleating behavior was confirmed by X-ray diffraction and small angle X-ray scattering analyses, which showed a decrease in the composites' crystalline lamella thickness (l(c)) and long period. X-ray microtomography data confirms that this behavior is significantly affected by the mGO agglomerates distribution and specific surface area inside the polymer matrix. The rheological behavior was studied under two different conditions. It was noticed that under lower shear stresses the mGO particles hinder the polymer flow, increasing the composites viscosity and the pseudo-solid character. However, under higher shear stresses, for example, when flowing through a die, the nanomaterial enters its ``superlubricity state,{''} acting as a lubricant to the flow. This is industrially interesting, because it may allow the use of less severe processing parameters to produce the nanocomposites. (AU)

• 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: 18/18055-0 - Investigação das propriedades de barreira de nanocompósitos PET/GO para a indústria de embalagens
• Beneficiário: Giovanna da Cruz Silva
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• 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: 18/05440-2 - Propriedades mecânicas e de barreira de nanocompósitos formados por politerftalato de etileno e óxido de grafeno (PET/GO)
• Beneficiário: Gabriel Matheus Pinto
• Modalidade de apoio: Bolsas no Brasil - Mestrado