Physico-chemical modification of polyolefins irradiated by swift .pdf

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1、NuclearInstrumentsandMethodsinPhysicsResearchB107(1996)276-280NMBBeamInteractionswithMaterials&AtomsELSEVIERPhysico-chemicalmodificationofpolyolefinsirradiatedbyswiftheavyionsP.Yu.Ape1a**,A.Yu.Didyka,A.G.SalinabaFLhfR,JINR,141980Dubna.RussiabS.-PetersburgStateTechnicalUniversity,S.-Petersbur

2、g,195251,RussiaAbstractThephysico-chemicalmodificationsofpolypropylene(PP)andpolyethylene(PE)inducedbyIMeV/uXeionswerestudied.Theirradiatedsampleswereinvestigatedexsitubymeansofultraviolet(UV)spectroscopy,solubilitymeasure-mentsandgelpermeationchromatography(GPC).Theformationofdoublebonds,di

3、enesandtrieneswasobservedbothinPEandPP.TheefficiencyofthegenerationofunsaturatedchemicalbondswasfoundtodependonsmallamountsofaromaticadditivesinPP.Similarly,thetracketchrateinPPincreaseswithincreasingconcentrationofantioxidantmolecules.Roughestimatesofradiolyticyieldsofdifferentstructureswer

4、ecarriedoutonthebasisoftheUVandGPCmeasurements.Itisapparentthattherearetwobasicallydifferentprocessesinducedbyswiftheavyionspassingthroughthepolyolefin:(a)localintratrackreactions;(b)reactionsinducedbyactivespeciesleavingthetracksanddiffusingintosurroundingmatrix.Theformerprocessleadstothefo

5、rmationofetchabledamage.Thelatteronemaycauseamutualinfluenceoftracksevenatfairlylowionfluences.1.IntroductionasIPPlandIPP?isotacticpolypropylenefilmofUSSRproduction,IPP3;andahighdensitypolyethylenefilmTechnicallyusedpolymericfilmsoftenserveastrackwiththethicknessof12pm.Accordingtoultraviolet

6、detectorsandasinitialmaterialfortrackmembranepro-absorptionspectra,thePPfilmscontaineddifferentduction.Energydissipationofaswiftheavyionandamountsofphenolicantioxidants:0.1,0.5andca.0.15%subsequentphysico-chemicalmodificationofthepolymerforIPPl,IPP2andIPP3,respectively.Theultravioletarethefi

7、rststageintheparticleregistrationprocess.spectraoftheantioxidantextractedfromthefilmswerePhysico-chemicalchangescauseanincreasingchemicalidenticaltothatofIrganox1010whichisawellknownactivityofpolymericmatrixintrackedareas.Thisphe-stericallyhindered