Dispersão de grafeno e óxido de grafeno em matrizes poliméricas

Página do item simplificado
dc.contributor.advisorFechine, Guilhermino José Macêdo
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/8109533360196619por
dc.contributor.authorAraujo, Mayara Cardoso de
dc.creator.Latteshttp://lattes.cnpq.br/6237036078875435por
dc.date.accessioned2020-12-09T13:50:55Z
dc.date.accessioned2021-02-08T22:02:08Z
dc.date.available2021-02-08T22:02:08Z
dc.date.issued2020-03-12
dc.description.abstractPolymer nanocomposites obtained by the insertion of two-dimensional (2D) filler via melt mixing have been the subject of study by several researchers due to the increase in the mechanical, thermal and electrical properties that these particles can provide to the polymer. This increase in the mentioned properties depends directly on the dispersion of the nanoparticles in the matrix and the interaction generated between filler and polymer. This work deals with to the preparation and characterization of nanocomposites based on linear low density polyethylene - LLDPE and Poly (butylene adipate-co-terephthalate) - PBAT as matrices and graphene (G) and graphene oxide (GO) as fillers, and thus evaluate the interaction of these charges with each type of polymer and how this is reflected in the physical properties of these materials. Graphite oxide (GrO) obtained by the Hummers method was characterized by Raman spectroscopy, X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Then, ultrasound exfoliation was performed to obtain graphene oxide (GO), with later characterization by atomic force microscopy (AFM). The commercial graphene acquired was analyzed and Raman spectroscopy signaled a graphene containing few layers. The nanocomposites were obtained by melt mixing using the Solid Solid Deposition method in a twin-screw extruder, using filler concentrations between 0 - 0.3% in weight. The nanocomposites were characterized by different techniques: mechanical analysis (tension), rheological analysis, dynamic-mechanical analysis (DMA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The LLDPE/G nanocomposites showed significant increases in mechanical properties for all compositions used, higher than the results obtained for LLDPE/GO. Likewise, graphene nanocomposites showed less damping factor (tan ) compared to graphene oxide nanocomposites. Both nanoparticles acted as nucleating agents for LLDPE and showed no evidence of re-stacking in the polymeric matrix. However, only the LLDPE/G nanocomposite (0.05%) showed the formation of a plateau in the storage modulus (G ') at low frequencies in rheological analysis. The PBAT / GO nanocomposites showed higher Young's modulus, deformation at break and toughness in mechanical tests compared to PBAT/G. Graphene oxide aided the PBAT crystallization process and increased its crystallinity at concentrations of 0.05% and 0.3%. Graphene also acted as a nucleating agent for PBAT, even with the indication of its re-stacking in the polymer. In rheological tests, only PBAT/GO nanocomposites exhibited the beginning of the formation of a plateau in the storage modulus (G ') at low frequencies. These results indicate that the LLDPE/G and PBAT/GO systems have the best distribution and dispersion of nanoparticles in the polymeric matrix, due to their greater interaction between load and polymer, which promotes a greater increase in the properties of nanocomposites.eng
dc.description.sponsorshipFundo Mackenzie de Pesquisapor
dc.formatapplication/pdf*
dc.identifier.citationARAUJO, Mayara Cardoso de. Dispersão de grafeno e óxido de grafeno em matrizes poliméricas. 2020. 79 f. Dissertação( Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo, 2020.por
dc.identifier.urihttp://dspace.mackenzie.br/handle/10899/27914
dc.keywordsnanocompositeseng
dc.keywordsgrapheneeng
dc.keywordsgraphene oxideeng
dc.keywordsdispersionpor
dc.keywordsinteractionpor
dc.languageporpor
dc.publisherUniversidade Presbiteriana Mackenziepor
dc.rightsAcesso Abertopor
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectnanocompósitospor
dc.subjectgrafenopor
dc.subjectóxido de grafenopor
dc.subjectdispersãopor
dc.subjectinteraçãopor
dc.subject.cnpqCNPQ::ENGENHARIASpor
dc.titleDispersão de grafeno e óxido de grafeno em matrizes poliméricaspor
dc.typeDissertaçãopor
local.contributor.board1Ribeiro, Hélio
local.contributor.board2Carastan, Danilo Justino
local.contributor.board2Latteshttp://lattes.cnpq.br/7462836318959519por
local.publisher.countryBrasilpor
local.publisher.departmentEscola de Engenharia Mackenzie (EE)por
local.publisher.initialsUPMpor
local.publisher.programEngenharia de Materiais e Nanotecnologiapor
Arquivos
Pacote Original
Agora exibindo 1 - 1 de 1
Imagem de Miniatura
Nome:
Mayara Cardoso de Araujo_protegida.pdf
Tamanho:
4.11 MB
Formato:
Adobe Portable Document Format
Descrição:
Baixar
Coleções
Engenharia de Materiais e Nanotecnologia - Dissertações - EE Higienópolis