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Master's Dissertation
DOI
Document
Author
Full name
Lucas Narcizo de Moura
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2019
Supervisor
Committee
Valera, Ticiane Sanches (President)
Silva, Leonardo Gondim de Andrade e
Souza, Adriana Martinelli Catelli de
Title in Portuguese
Estudo de um método simples para produção de nanocompósitos de grafeno multicamadas no poliestireno-bloco-polibutadieno-bloco-poliestireno.
Keywords in Portuguese
Elastômeros
Grafeno Multicamadas (GMC)
Nanocompósitos
Poliestireno-bloco-polibutadieno-bloco-poliestireno (SBS)
Abstract in Portuguese
Nessa dissertação, o grafeno multicamadas (GMC) foi obtido por meio de sonicação direta em N-metil-2-pirrolidona (NMP), utilizando ultrassom de ponteira, na presença de poliestireno-bloco-polibutadieno-bloco-poliestireno (SBS). O nanocompósito de SBS com 12,4% em massa de GMC foi produzido por co-coagulação e posteriormente processado termicamente em extrusora dupla rosca com mais SBS, formando nanocompósitos com 0,5% e 1,0% em massa de GMC. As micrografias obtidas por microscopia eletrônica de transmissão (MET) e microscopia eletrônica de varredura (MEV) indicaram a presença de grafeno e GMC dispersos na matriz polimérica. Os resultados obtidos por espectroscopia vibracional de absorção no infravermelho com transformada de Fourier (FTIR) indicaram uma possível interação entre o grafeno e os blocos de poliestireno, o que pode ter auxiliado no processo de esfoliação. A análise termogravimétrica (TG) demonstrou que o processo tem rendimento compatível com outros processos de obtenção do grafeno. Os ensaios de tração e de dureza mostraram que o GMC pode ter efeito reforçante no nanocompósito. O processo com poucas etapas e com uso de poucos reagentes, desenvolvido nesse trabalho, mostrou-se uma alternativa promissora para produção de nanocompósitos de grafeno em grande escala.
Title in English
Study of a simple method to produce multilayer graphene nanocomposites with polystyrene-block-polybutadiene-block-polystyrene.
Keywords in English
Multilayer Graphene (MLG)
Nanocomposites
Polystyrene-block-polybutadiene-block-polystyrene (SBS)
Thermoplastic elastomers
Abstract in English
In this work multilayer graphene (MLG) was obtained through direct sonication of graphite in N-methyl-2-pirrolidone (NMP) using probe sonicator in the presence of polystyrene-block-polybutadiene-block-polystyrene (SBS). The nanocomposite of SBS with 12.4 wt% GMC was produced by co-coagulation and further thermally processed in a twin-screw extruder with more SBS to obtain nanocomposites with 0.5 wt% and 1.0 wt% GMC. Transmission Electronic Microscopy (TEM) and Scanning Electronic Microscopy (SEM) has shown individuals graphene layers and MLG well dispersed in the polymer matrix. The Infrared Spectra (FTIR) suggested a good interaction between graphene and the polystyrene (PS) blocks, which may have improved the exfoliation process. The thermogravimetric analysis (TGA) demonstrated a good efficiency in the process. Tensile and hardness tests indicate the reinforcement effect of MLG in the nanocomposite. The few steps process developed in this work using few reagents had been shown as a promising large-scale process to produce graphene nanocomposites.
 
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Publishing Date
2019-10-23
 
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