PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICS

A boric acid modified expandable graphite (EG B) was prepared through oxidizing-intercalating reaction of natural graphite, using H2SO4 and boric acid (H3BO3) as intercalators simultaneously. The dilatability of the intercalated products were characterized with expansion volume and initial expansion...

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Autores principales:	ZHAO,HONGMEI, LIN,RUINIAN
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2016
Materias:	Modified expandable graphite boric acid characteristics dilatability flame retardancy synergistic efficiency
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072016000100004
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spelling	oai:scielo:S0717-970720160001000042016-09-14PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICSZHAO,HONGMEILIN,RUINIAN Modified expandable graphite boric acid characteristics dilatability flame retardancy synergistic efficiency A boric acid modified expandable graphite (EG B) was prepared through oxidizing-intercalating reaction of natural graphite, using H2SO4 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 todetect its layer structure, main element relative contents and function group. At the same time, its influence on combustion characteristics and thermal stability forlinear 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) from17.6% 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.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.61 n.1 20162016-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072016000100004en10.4067/S0717-97072016000100004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Modified expandable graphite boric acid characteristics dilatability flame retardancy synergistic efficiency
spellingShingle	Modified expandable graphite boric acid characteristics dilatability flame retardancy synergistic efficiency ZHAO,HONGMEI LIN,RUINIAN PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICS
description	A boric acid modified expandable graphite (EG B) was prepared through oxidizing-intercalating reaction of natural graphite, using H2SO4 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 todetect its layer structure, main element relative contents and function group. At the same time, its influence on combustion characteristics and thermal stability forlinear 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) from17.6% 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.
author	ZHAO,HONGMEI LIN,RUINIAN
author_facet	ZHAO,HONGMEI LIN,RUINIAN
author_sort	ZHAO,HONGMEI
title	PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICS
title_short	PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICS
title_full	PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICS
title_fullStr	PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICS
title_full_unstemmed	PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICS
title_sort	preparation of boric acid modified expandable graphite and its influence on polyethylene combustion characteristics
publisher	Sociedad Chilena de Química
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072016000100004
work_keys_str_mv	AT zhaohongmei preparationofboricacidmodifiedexpandablegraphiteanditsinfluenceonpolyethylenecombustioncharacteristics AT linruinian preparationofboricacidmodifiedexpandablegraphiteanditsinfluenceonpolyethylenecombustioncharacteristics
_version_	1718445546309419008

PREPARATION OF BORIC ACID MODIFIED EXPANDABLE GRAPHITE AND ITS INFLUENCE ON POLYETHYLENE COMBUSTION CHARACTERISTICS

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