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THERMAL STABILITY AND FIRE BEHAVIOR OF POLYURETHANE NANOCOMPOSITE FOAMS: SYNERGISM BETWEEN HALOGEN FREE FLAME RETARDANT AND DIPHOSPHONIUM MODIFIED CLAY  
THERMAL STABILITY AND FIRE BEHAVIOR OF POLYURETHANE NANOCOMPOSITE FOAMS: SYNERGISM BETWEEN HALOGEN FREE FLAME RETARDANT AND DIPHOSPHONIUM MODIFIED CLAY
資料類型: PDF文件
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資料大?。?/td> 381K
所屬學科: 分子表征
來源: 2008納米填充阻燃聚合物及復合材料國際學術研討會(10.16-10.17,北京)
簡介:
Synergyinflameretardancyofrigidpolyurethanefoamsbetweenphosphorus-basedflameretardant(aluminiumphosphinate)andlayeredsilicateshasbeeninvestigated.Weusedpristinemontmorilloniteaswellasammoniummodifiedclay(commerciallyavailable)anddiphosphoniummodifiedclay,whichwassynthesisedbytheintercalationofthequaternarydiphosphoniumsalt.ThemorphologyofthefoamswerecharacterisedthroughSEM(ScanningElectronMicroscopy)andX-Raydiffraction(XRD),whilethermalpropertieswerecharacterisedbythermo-gravimetricanalyses(TGA),oxygenindextest(LOI)andconecalorimeter(CC).Themorphologicalcharacterisationshowedthatpristineanddiphosphoniummodifiedclaysarealmostslightlyintercalated,whileammoniummodifiedoneisverywelldispersed.Theresultsofthermalcharacterisationshowedthatinpresenceofphosphinateenhancementsofoxygenindex,firebehaviour(measuredbyconecalorimeter)andthermalstabilityhavebeenachieved.Phosphinateisthereforeanefficientflameretardantforpolyurethanefoamsanditsflameretardancyactiontakesplaceinbothcondensedandgasphases.Pristineandammoniummodifiedlayeredsilicatebringtosomeenhancementsofthermalstabilitywhilehavenoimportanteffectindecreasingpeakheatreleaserate(PHRR)andtotalheatevolved(THE)whenusedinconjunctionwithphosphinate;theirmainadvantageisrelatedtotheenhancementofcompactnessofthecharlayerformed.Diphosphoniumclayisinsteadeffectiveinfurtherimprovingthefirebehaviourofthefoamsbecauseoftheflameretardancyactionofphosphonium:bothPHRRandTHEweredecreased.Theanalysisofconecalorimeterdatashowedthatclaysactthroughphysicaleffectconstitutingabarrieratthesurfacewhichiseffectiveinpreventingorloweringdownthediffusionofvolatilesandoxygen,whilephosphinateandphosphoniumaremoreeffectiveowingtotheircombinedactioninbothcondensedandgasphase.
作者: M. Modesti, A. Lorenzetti, S. Besco, D. Hrelja, M. Roso
上傳時間: 2009-02-17 14:13:31
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navy608    2010-11-29 14:09:31
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jojoo    2009-10-07 9:23:36
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gl-xu    2009-03-03 20:13:24
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