-ASTMD353693W07595300503334Bm[[TbDesignation:D3536-91AMERICANSOCIETYFORTESTINGANDMATERIALS1916RaceStPhiladelphia,Pa19103ReprlntedfromtheAnnualBookofASTMStandards.CopyrightASTMIfnotlistedinthecurrentcombinedindex,willappearinthene*ediion.StandardTestMethodforMolecularWeightAveragesandMolecularWeightDistributionbyLiquidExclusionChromatography(GELPermeationChromatography-GPC)'ThisstandardisissuedunderthefixeddesignationD3536;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(0indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofmolec-ularweight(MW)averagesandthedistributionofmolecularweightsinlinearsolublepolystyrenebyliquidexclusionchromatography(gelpermeationchromatography-GPC).Thetestmethodusescommerciallyavailablepolystyrene(PS)standardsandequipmentforthispurposeandisapplicableforsamplescontainingmolecularweightcompo-nentsfrom5000to3Xlo6g-mol-'.Thisisdiscussedinmoredetailin12.1.Thetestmethodisnotabsoluteandrequirescalibration.1.2ThevaluesstatedinSIunits,basedonPracticeE380,aretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D3016PracticeforUseofLiquidExclusionChromatog-E380PracticeforUseoftheInternationalSystemof2.2OtherDocument:AMD40BibliographyonLiquidExclusionChromato-raphyTermsandRelationshipszUnits(SI)3PPhY43.SummaryofTestMethod3.1Inthistechniqueasolutionofapolymersampleisinjectedintoachromatographiccolumn(series)packedwithasolid,poroussubstratewhichseparatesthediversemole-culesaccordingtotheirsizeinsolution.Thesize-separatedmoleculesaredetectedandrecordedaccordingtotheirconcentration.Throughcalibration,suesare...
