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THERMAL STABILITY AND FIRE BEHAVIOR OF POLYURETHANE NANOCOMPOSITE FOAMS: SYNERGISM BETWEEN HALOGEN FREE FLAME RETARDANT AND DIPHOSPHONIUM MODIFIED CLAY

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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

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2009-02-17 14:13:31

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navy608 2010-11-29 14:09:31

好東西，謝謝了

jojoo 2009-10-07 9:23:36

thanks

yehlongy 2009-06-24 10:50:53

好東西謝謝了

gl-xu 2009-03-03 20:13:24

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