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1、PolymerInternationalPolymInt54:981998(2005)DOI:10.1002/pi.1806ReviewOverviewofrecentdevelopmentsintheflameretardancyofpolycarbonatesSergeiVLevchik1∗andEdwardDWeil21SuprestaUSLLC,1LivingstoneAvenue,DobbsFerry,NY10522,USA2PolytechnicUniversity,SixMetrotechCenter,B
2、rooklyn,NY11201,USAAbstract:Thispaperpresentsanoverviewoftherecentliteratureonflameretardancyofpolycarbonate(PC)andpolycarbonate-basedresins.AbriefsurveyofthemajormechanismsofthermaldecompositionofPCisalsopresentedbecauseitgivesinsightinthemechanismsofflameretard
3、antaction.MostlyindustriallaboratoriesareinvolvedinthedevelopmentofnewflameretardantsforPCand,toamuchlesserextent,academiclaboratoriesaredoingresearchonthemechanisticaspectsofflameretardancy.ThenumberofpatentspublishedannuallyontheflameretardancyofPCanditsblendssi
4、gnificantlyexceedsthenumberofpatentsonflameretardancyofanyotherpolymer.BecausePCisanaturallyhighcharringpolymer,thecondensedphaseactiveflameretardants,inparticularphosphorus-basedones,arewidelyusedinPC-basedblends.PlainPCcanpassstringentflameretardanttestswithveryl
5、owadditionsofsomesulfur-orsilicone-basedflameretardants.2005SocietyofChemicalIndustryKeywords:polycarbonate;combustion;thermaldecomposition;flameretardancy;aromaticphosphates;sulfonates;polysiloxanesINTRODUCTIONformulationsitisusuallylower.ByvaryingtheAlthoughso
6、mealiphaticpolycarbonatesareknownpolycarbonateandABSgradesandproportions,ithasforspecialapplications,thelargestcommercialprod-beenpossibletoclosethetechnologicalgapbetweenuctsarearomaticpolycarbonatesand,particularly,ABSandbisphenolApolycarbonate.2Themechanical
7、poly[2,2-propane(bisphenol)carbonate](herecalledpropertiesvarywiththecompositionoftheblend.polycarbonateorPC)manufacturedfrombisphe-TheflammabilityofPC/ABSblendsverymuchnolA.TheannualvolumeofthispolymerexceedsdependsontheratioPC/ABS.AlthoughPCis1millionmetricton
8、s.PCisanamorphouspolymerrelativelyeasytoflameretard,ABSisverycombustiblewitharelativelyhighglasstransitiontemperature,andtendstogenerateheavyblacksmoke.TheT,=140150◦C.1Becaus
