thermal and thermo-oxidative degradation of flame retardant high impact polystyrene with triphenyl phosphate and novolac epoxy resin

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1、ThermalandThermo-oxidativeDegradationofFlameRetardantHighImpactPolystyrenewithTriphenylPhosphateandNovolacEpoxyResin486DOil0.1007/sll595.006.3486.3Vo1.22No.31,1HuiyongetaL"ThermalandThermo-oxidativeDegradationofFlameThermalandThermo?oxidativeDegradationofFlameReta

2、rdantHighImpactPolystyrenewithTriphenylPhosphateandNovolaeEpoxyResinLIHuiyong,CAIChanggeng,CHENYukun,JIADemin'(CoHegeofMaterialsScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510641,China)Abstract:Thermalandthermo.oxidativedecompositionanddecompos

3、itionkineticsofflameretardanthighimpactpolystyrene(HIPS)withtriphenylphosphate(TPP)andnovolactypeepoxyresin(NE)werecharacterizedusingthermo-gravimetricexperiment.Andtheflammabilitywasdeterminedbylimitedoxygenindices(LOI).TheLOIresultsshowthatTPPandNEhadagoodsynthe

4、ticeffectontheflameretardancyofHIPS.ComparedwithpureHIPS,theLOIvaluesofHIPS/NEandHIPS/TPPonlyincreasedbyabout5%.andtheLOIvalueofHIPS/TPP/NEreached42-3%.nearly23%abovethatofHIPS.AUmaterialsshowedonemaindecompositionstep.asradicalHIPSscissionpredominatedduringanaero

5、bicdecomposition.TPPincreasedtheactivityenergyeffectivelywhileNEaffectedthetherma1.oxidativedegradationmorewiththehelpofthecharformation.WithbothTPPandNE.thematerialscouldhaveacomparablegoodresultofboththermalandthermal-oxidativedegradation,whichcouldcontributetot

6、heireffectontheflameretardancy.Keywords:highimpactpolystyrene;flameretardant;thermaldegradation;thermooxidativedegradation1IntroductionThereductionandsubstitutionofflameretardantscontaininghalogenwereprogressingintermsoftoxicologicalandenvironmentalaspects.Nowaday

7、s,enormouslyintenseresearchesareperformedtoreplacethehalogen--typeflameretardantsbynon--halogentypes,andtheflameretardantsbasedonphosphorus—containingcompoundsareknowntobethemostpromisingcandidatesforthispurpose''.Amongvariousphosphorus—basedflameretardants,TPPand

8、itsanaloguesarewidelyknowntobeoneofthemosteffectiveflameretardantsformanypolymersincludingHIPS【引.DuringtherlTlaldegradation.TPPitselfcouldgeneratephosph