Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation

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dc.contributor.authorIto, Edson Noryuki
dc.contributor.authorCavalcante, Manoella Silva
dc.contributor.authorPaz, Simone Patrícia Aranha
dc.contributor.authorAngélica, Rômulo Simões
dc.contributor.authorNeves, Roberto Freitas
dc.date.accessioned2021-09-23T13:37:01Z
dc.date.available2021-09-23T13:37:01Z
dc.date.issued2016-03-01
dc.description.resumoThe use of Mg-montmorillonite in the production of organoclay without sodium activation was investigated. For this purpose, organophilization experiments were carried out by varying the concentration of two surfactants: hexadecyltrimethylammonium (HDTMA+) and dodecyltrimethy-lammonium (DTMA+) ions. These surfactants were used at concentrations 0.7, 1.0 and 1.5 times that of the cation exchange capacity (62.6 meq/100 g) of the clay, with a reaction time of 8 h at temperatures of 25 and 80°C. X-ray diffraction (XRD) results confirmed the intercalation for both in natura and activated samples. The Fourier-transform infrared (FTIR) spectroscopy and XRD results showed that the ratio of gauche/trans conformers decreased with increased basal spacing. The results of thermodifferential and thermogravimetric analysis (DTA/DTG) confirmed the thermal stability of the organoclay up to 200°C, permitting the use of such material in the synthesis of polymer/clay nanocomposites obtained by the melt blending. Thus, Mg-montmorillonite can be intercalated with alkylammonium ions without prior Na-activation to form organoclays. The possibility of using natural (non-activated) Mg-montmorillonite represents a significant difference in terms of processing cost in comparison with existing Ca-montmorillonite in Brazil or even with imported bentonites that require Na-activation during beneficiationpt_BR
dc.identifier.citationCAVALCANTE, Manoella Silva; PAZ, Simone Patrícia Aranha; ANGÉLICA, Rômulo Simões; ITO, Edson Noryuki; NEVES, Roberto Freitas. Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation. Clay Minerals, [S.L.], v. 51, n. 1, p. 39-54, mar. 2016. Disponível em: https://pubs.geoscienceworld.org/claymin/article-abstract/51/1/39/311533/Organophilization-of-a-Brazilian-Mg?redirectedFrom=fulltext. Acesso em: 27 abr. 2021. http://dx.doi.org/10.1180/claymin.2016.051.1.04.pt_BR
dc.identifier.doi10.1180/claymin.2016.051.1.04
dc.identifier.issn0009-8558
dc.identifier.issn1471-8030
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/37977
dc.languagefrpt_BR
dc.publisherMineralogical Societypt_BR
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Brazil*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/br/*
dc.subjectMg-montmorillonitept_BR
dc.subjectOrganoclaypt_BR
dc.subjectSmectitept_BR
dc.subjectBentonitept_BR
dc.subjectSodium activationpt_BR
dc.titleOrganophilization of a Brazilian Mg-montmorillonite without prior sodium activationpt_BR
dc.typearticlept_BR

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