Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114101
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dc.contributor.authorCORRÊA, A. C.eng
dc.contributor.authorCARMONA, V. B.eng
dc.contributor.authorSIMÃO, J. A.eng
dc.contributor.authorGALVANI, F.eng
dc.contributor.authorMARCONCINI, J. M.eng
dc.contributor.authorMATTOSO, L. H. C.eng
dc.date.accessioned2019-11-09T00:40:44Z-
dc.date.available2019-11-09T00:40:44Z-
dc.date.created2019-11-08
dc.date.issued2019
dc.identifier.citationPolymers, v. 11, n. 1785, p. 1-19, 2019.eng
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1114101-
dc.descriptionCellulose nanocrystals (CNC) were obtained from macauba and gravata fibers. Macauba (or Bocaiuva) is a palm tree found throughout most of Brazil and Gravata is an abundant kind of bromeliab with 1-2m long leaves, found in Brazilian Pantanal and Cerrado. The raw fibers of both fibers were mercerized with NaOH solutions and bleached; they were then submitted to acid hydrolysis using H2SO4 at 45 ?C, varying the hydrolysis time from 15 up to 75 min. The fibers were analyzed by X-ray diffraction (XRD), FTIR Spectroscopy, scanning electron microscopy (SEM) and thermal stability by thermogravimetric analysis (TG). XRD patterns did not present changes in the crystal structure of cellulose after mercerization, but it was observed a decrease of hemicellulose and lignin contents, and consequently an increase of cellulose content with the increase of NaOH solution concentration in the mercerization. After acid hydrolysis, the cellulose nanocrystals (CNC) were also analyzed by transmission electron microscopy (TEM) which showed an acicular or rod-like aspect and nanometric dimensions of CNC from both fibers, but the higher values of aspect ratio (L/D) were found on CNC obtained from gravata after 45 min of acid hydrolysis. The mercerization and subsequent bleaching of fibers influenced the crystallinity index and thermal stability of the resulting CNC, but their properties are mainly influenced by the hydrolysis time, i. e., there is an increase in crystallinity and thermal stability up to 45 min of hydrolysis, after this time, both properties decrease, probably due to the cellulose degradation by the sulfuric acid.eng
dc.language.isoengeng
dc.rightsopenAccesseng
dc.titleCellulose nanocrystals from fibers of Macauba (Acrocomia Aculeata) and Gravata (Bromelia Balansae) from Brazilian Pantanal.eng
dc.typeArtigo de periódicoeng
dc.date.updated2019-11-09T00:40:44Z
dc.subject.thesagroCeluloseeng
dc.subject.thesagroMacaúbaeng
dc.subject.thesagroFibra Vegetaleng
dc.subject.thesagroGravataeng
dc.subject.nalthesaurusCelluloseeng
dc.subject.nalthesaurusNanocrystalseng
dc.subject.nalthesaurusPlant fiberseng
dc.subject.nalthesaurusAcrocomiaeng
riaa.ainfo.id1114101eng
riaa.ainfo.lastupdate2019-11-08
dc.identifier.doidoi:10.3390/polym11111785eng
dc.contributor.institutionANA CAROLINA CORRÊA; VITOR BRAIT CARMONA, UFSCar; JOSÉ ALEXANDRE SIMÃO, UFSCar; FABIO GALVANI, CPAP; JOSE MANOEL MARCONCINI, CNPDIA; LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA.eng
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