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空穴凝胶色谱研究形成SBS胶束的热力学(英文).docx

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空穴凝胶色谱研究形成SBS胶束的热力学(英文) Title:ThermodynamicStudyofFormationofSBSMicellesbySolventEvaporationGelPermeationChromatography Abstract: TheformationofSBS(Styrene-Butadiene-Styrene)micellesviathesolventevaporationmethodwasinvestigatedusinggelpermeationchromatography(GPC)combinedwiththermodynamicsanalysis.TheGPCtechniqueallowedustomonitorthechangesinthemolecularweightdistributionofSBSduringthemicelleformationprocess,whilethethermodynamicanalysisprovidedinsightsintothefactorscontributingtotheenthalpicandentropicchanges.ThisstudyaimedtounderstandthethermodynamicaspectsofSBSmicelleformation,whichcanfacilitatethedevelopmentofmoreefficientandcontrolledtechniquesforpreparingSBS-basedmaterials. Keywords:SBS,micelles,solventevaporation,gelpermeationchromatography,thermodynamics 1.Introduction: Micellarstructureshavegainedsignificantattentionduetotheiruniquepropertiesandpotentialapplicationsinvariousfields,includingdrugdelivery,oilrecovery,andpolymersciences.SBSblockcopolymersareoneofthemostwidelystudiedmaterialsformicelleformation,thankstotheiramphiphilicnatureresultingfromthecombinationofstyreneandbutadieneblocks. ThesolventevaporationmethodiscommonlyemployedfortheformationofmicellesfromamphiphilicblockcopolymerslikeSBS.Theprocessinvolvesdissolvingtheblockcopolymerinaselectivesolvent,followedbyslowevaporationofthesolventtopromoteself-assemblyintomicelles.Understandingthethermodynamicaspectsofthisprocessiscrucialforoptimizingthemicelleformationandcontrollingthepropertiesofresultingmicellarsystems. 2.ExperimentalProcedure: 2.1Materials: SBSblockcopolymerwithastyrenetobutadieneratioof1:1wasusedasthestartingmaterial.Toluenewaschosenasthesolventduetoitscompatibilitywithbothstyreneandbutadieneblocks. 2.2SamplePreparation: ApredeterminedamountofSBSwasdissolvedintolueneundervigorousstirringuntilaclearsolutionwasobtained.Theresultingpolymersolutionwasthentransferredtoaround-bottomflaskandexposedtoambientconditionsforsolventevaporation.Sampleswerecollectedatdifferenttimeintervalsduringtheev