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

Página do item simplificado
dc.contributor.authorPinto G.M.
dc.contributor.authorSilva G.D.C.
dc.contributor.authorSantillo C.
dc.contributor.authorLavorgna M.
dc.contributor.authorMaia J.M.
dc.contributor.authorFechine G.J.M.
dc.date.accessioned2024-03-12T23:46:13Z
dc.date.available2024-03-12T23:46:13Z
dc.date.issued2020
dc.description.abstract© 2020 Society of Plastics EngineersThis 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 (Tmc) 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 (lc) 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.
dc.description.firstpage2841
dc.description.issuenumber11
dc.description.lastpage2851
dc.description.volume60
dc.identifier.doi10.1002/pen.25516
dc.identifier.issn1548-2634
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/34881
dc.relation.ispartofPolymer Engineering and Science
dc.rightsAcesso Restrito
dc.subject.otherlanguagecrystallization
dc.subject.otherlanguagegraphene oxide
dc.subject.otherlanguagenanocomposite
dc.subject.otherlanguagepoly(ethylene terephthalate)
dc.subject.otherlanguagerheology
dc.titleCrystallization kinetics, structure, and rheological behavior of poly(ethylene terephthalate)/multilayer graphene oxide nanocomposites
dc.typeArtigo
local.scopus.citations13
local.scopus.eid2-s2.0-85089899762
local.scopus.subjectCrystalline lamella
local.scopus.subjectGraphene oxide nanocomposites
local.scopus.subjectMelt crystallization
local.scopus.subjectNucleating agents
local.scopus.subjectProcessing parameters
local.scopus.subjectRheological behaviors
local.scopus.subjectTwin screw extrusion
local.scopus.subjectX ray microtomography
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85089899762&origin=inward
Arquivos
Coleções
Artigos de periódico