【英文标准名称】:Plastics-Determinationofaveragemolecularmassandmolecularmassdistributionofpolymersusingsize-exclusionchromatography-Part2:Universalcalibrationmethod
【原文标准名称】:塑料.用粒度排除色谱法测定平均分子质量和分子质量分布.第2部分:通用校准法
【标准号】:ISO16014-2-2003
【标准状态】:作废
【国别】:国际
【发布日期】:2003-04
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC61
【标准类型】:()
【标准水平】:()
【中文主题词】:分子质量;塑料;定义;胶化渗透色谱法;测量技术;测定;色谱法;校正;原理;平均;分子;测量原理;测量方法;质量(物质);方法;大小测量
【英文主题词】:Average;Calibration;Chromatography;Definitions;Determination;Gelpermeationchromatography;Mass;Measuringtechniques;Methods;Methodsformeasuring;Molecularmass;Molecules;Plastics;Principle;Principleofmeasurement;Sizemeasurement
【摘要】:ThispartofISO16014specifiesamethodfordeterminingtheaveragemolecularmassandthemolecularmassdistributionofpolymersusingsize-exclusionchromatography(SEC).Theaveragemolecularmassandthemolecularmassdistributionarecalculatedusingauniversalcalibrationcurveinsteadoftheconventionalcalibrationcurve.TheconceptoftheuniversalcalibrationmethodisbasedonarelationshipbywhichtheretentiontimeinSECdependsonthesizeofthepolymermolecule(thehydrodynamicvolume)orontheproductoftheintrinsicviscosity[η]andthemolecularmassM.Manypolymersclassifiedasrandom-coilpolymers(regardlessoftheirchemicalstructure,degreeofbranching,compositionortacticity)havebeenexperimentallyconfirmedasfollowingthisrelationship.Theuniversalcalibrationcurveisconstructedbyplottingthelogarithmof[η]MversustheelutiontimetorelutionvolumeVusingpolymerstandardssuchaspolystyrenewithnarrowmolecularmassdistributions.ThemolecularmassMiofanunknownpolymersamplecanthenbecalculatedfromthevalueof[η]Mateachretentiontimeusingtheuniversalcalibrationcurveand[η]orKandaintheMark-Houwink-Sakuradaequation([η]=KM→[η]M=KM,whereKisaconstantandaisanexponentdependingontheexperimentalconditions.ThereforethistestmethodisclassifiedasarelativemethodasdescribedinISO16014-1,buttheaveragemolecularmassesandmolecularmassdistributionscalculatedbythemethodareequalto,ornearlyequalto,theabsolutevalues.AlistofdocumentsrelatedtothispartofISO16014isgivenintheBibliography.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:12P;A4
【正文语种】:英语