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1、WritingScientificPapersinEnglishEffectofDifferentCore-ShellWeightRatiosofImpactModifiertoToughedPolycarbonateAbstractPolycarbonate(PC)hasexcellentmechanicalpropertiesatroomtemperature,dimensionalstability,heatresistanceandelectricalinsulation,butitslowtempera
2、turetoughnesslimitsitsapplication.Thetougheningofpolycarbonatehasattracteddramaticallyattention.However,verylittleresearchhasbeencarriedouttoinvestigatetheeffectofcore-shellimpactmodifierstructureontoughenedPC.Inthisstudy,core-shellstructuredpolyacrylic(named
3、ACR)impactmodifiersconsistingofarubberypoly(n-butylacrylate)(BA)coreandarigidpoly(methylmethacrylate)shellwithdifferentcore-shellweightratios(85:15;80:20;75:25;70:30)werepreparedtomodifythetoughnessofPC.ThemechanicalpropertiesoftheACR/PCblendsweremeasured,and
4、scanningelectronmicroscope(SEM)wasusedtoobservethefracturedmorphology.Asaresult,thenotchimpactstrengthofACR/PCblendswithacore-shellweightratioof80:20was6.7timesgreaterthanthatofpurePC,andthemechanicalpropertiesagreedwellwiththeSEMobservation.KeywordsCore-shel
5、lstructuredpolyacrylicPolycarbonateToughnessStructure-propertyrelations9WritingScientificPapersinEnglishIntroductionPolycarbonateexhibitsaseriesofexcellentpropertiesincludingremarkableheatresistance,toughness,opticaltransparency,andelectricalproperties[1].The
6、secharacteristicsmakeitattractiveforuseinmanyapplicationsrangingfromvideodisktohelmetforastronauts.Nevertheless,PCwillundergobrittlefractureduringimpacttestsinthepresenceofnotchesthatconcentratestressduetoitslow-crackpropagationenergy,especiallyatlowtemperatu
7、re[2].Moststudiesonthebrittlefracturebehavioroftoughenedpolycarbonatearestudiedinliterature.Forexample,Yeeetal.[3]investigatedthefracturemechanismoftoughenedPCblendsandconcludedthatcavitationofrubberparticlesoccursfirst,followedbytheenhancedshearyieldingofthe
8、matrix.Chengetal.[4]studiedtheeffectofthreedifferentelastomersonthetoughnessofPCandfoundthatmaximumtoughnesswasobtainedwithacore-shellimpactmodifier.Parkeretal.[5]modifierswithgreatercavi
