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dc.contributoren-US
dc.creatorZhao, Hongmei
dc.creatorPang, Xiuyan
dc.creatorLin, Ruinian
dc.date2015-12-10
dc.date.accessioned2019-09-10T17:53:35Z
dc.date.available2019-09-10T17:53:35Z
dc.identifierhttp://www.jcchems.com/index.php/JCCHEMS/article/view/40
dc.identifier.urihttps://revistaschilenas.uchile.cl/handle/2250/108690
dc.descriptionA boric acid modified expandable graphite (EGB) was prepared through oxidizing-intercalating reaction of natural graphite, using H3SO4 and boric acid (H3BO3) as intercalators simultaneously. The dilatability of the intercalated products were characterized with expansion volume and initial expansion temperature. Scanning electron microscope, X-ray diffraction spectroscopy, energy dispersive spectroscopy and Fourier transform infrared spectroscopy were employed to detect its layer structure, main element relative contents and function group. At the same time, its influence on combustion characteristics and thermal stability for linear low density polyethylene (LLDPE) were investigated in limiting oxygen index (LOI) tests, vertical burning tests and thermal gravimetric/differential thermal gravimetric analyses. Comparing with the normal expandable graphite (EG, intercalated by single H2SO4), EGB exhibited high dilatability, thermal stability and flame retardancy for LLDPE. It had been testified by combustion tests that the addition of 30 wt % EGB to LLDPE improved the limiting oxygen index (LOI) from 17.6% to 30.2%, and the vertical burning level of UL-94 standard reached V-0 level. Whereas, the LOI of the same amount referenced EG was only 25.1%, the UL- 94 level only reached V-1. Moreover, the synergistic effect between EGB and ammonium polyphosphate (II) (APP) improved the LOI of 70LLDPE/10APP/20EGB composite to 33.0%, and the UL-94 level to V-0. The synergistic efficiency was attributed to the formation of continuous and compact residual char.en-US
dc.formatapplication/pdf
dc.languageeng
dc.publisherSociedad Chilena de Químicaen-US
dc.relationhttp://www.jcchems.com/index.php/JCCHEMS/article/view/40/38
dc.rightsCopyright (c) 2016 Hongmei Zhao, Xiuyan Pang, Ruinian Linen-US
dc.rightshttp://creativecommons.org/licenses/by-sa/4.0en-US
dc.sourceJournal of the Chilean Chemical Society; Vol 61, No 1 (2016): Journal of the Chilean Chemical Societyen-US
dc.source0717-9707
dc.subjectModified expandable graphite; Boric acid; Characteristics; Dilatability; Flame retardancy; Synergistic efficiencyen-US
dc.titlePREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICSen-US
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeen-US


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