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1、JPOL3249Polymer40(1999)3487±3499Acetonesorptionanduptakekineticinpoly(ethyleneterephthalate)a,abC.C.McDowell*,B.D.Freeman,G.W.McNeelyaDepartmentofChemicalEngineering,NorthCarolinaStateUniversity,Raleigh,NC27695-7905,USAbHoechst-CelaneseCorporation,Spartanburg,SC,USAReceive
2、d11March1998;receivedinrevisedform8May1998;accepted18May1998AbstractThesorptionandkineticsofacetoneuptakeinsolventcast?lmsofpoly(ethyleneterephthalate)arereportedat358Cforacetonepressuresrangingfrom0to7.3cmHg.Theequilibriumsorptionisothermiswelldescribedbythedual-modesorpt
3、ionmodelwiththefollowing3393311parameters:kD?61cm(STP)/(cm′atm),CH?7:2cm(STP)=cm,andb?50atm.Sorptionkineticsaredescribedusingatwo-stagemodelwhichincorporatesbothFickiandiffusionandprotractedpolymerstructuralrelaxation.Thecharacteristictimeassociatedwiththerelaxationprocess
4、isessentiallyindependentofacetoneconcentrationandhasanaveragevalueofapproximately15hours.Thefractionofsorptionassociatedwithpolymerrelaxationincreaseslinearlywithacetoneconcentrationintheequilibrium-densi?edmatrixofthepolymer.Acetonediffusioncoef?cientsincreasewithincreasi
5、ngacetoneconcentration.Theconcentrationdependenceoftheacetonediffusioncoef?cientiswelldescribedbythedual-mobilitymodeliftheassumptionofconstantdiffusioncoef?cientsinthetwomodesisrelaxed.q1999ElsevierScienceLtd.Allrightsreserved.Keywords:Sorption;Diffusion;Acetone1.Introduc
6、tionsorptionmodel[7].LiuandNeogimeasuredmethylenechloridevaporsorptionkineticsinPEToverawiderangePoly(ethylenetherephthalate)[PET]isanimportantofpenetrantactivityandobservedFickianmassuptakebarriermaterialthatiswidelyusedtopackagefoodsandkinetics[8].Thesorptionisothermofme
7、thylenechloridebeverages[1].AnimportantconsiderationinbarrierinPETwaswelldescribedbythegeneralizeddual-modepackagingapplicationsisthelossoforganicˉavormodel[8].Inanotherstudy,thekineticsofbenzeneuptakemolecules,suchasd-limoneneinfruitjuices,asaresultinPETwererationalizedus
8、ingamodelwhichcombinedofscalping,i.e.sorptionoftheˉavormoleculesintopack-Fickiandiffusion
