【英文标准名称】:StandardTestMethodforMolecularMassAveragesandMolecularMassDistributionofAtacticPolystyrenebyMatrixAssistedLaserDesorption/Ionization(MALDI)-TimeofFlight(TOF)MassSpectrometry(MS)
【原文标准名称】:用矩阵辅助激光解吸/离子化(MALDI)-飞行时间(TOF)质谱(MS)法测定无规立构聚苯乙烯的平均分子量和分子量分布的标准试验方法
【标准号】:ASTMD7134-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.70
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:电离;质谱学;平均值;解吸;时间;模型;试验;分配;聚苯乙烯;塑料;飞行;分子质量;激光器
【英文主题词】:massaveragemolecularmass(Mw);massspectrometry(MS);matrixassistedlaserdesorbtion/ionization(MALDI);molecularmassaverage;molecularmassdistribution(MMD);moleculeaveragemolecularmass(Mn);polystyrene
【摘要】:1.1Thistestmethodcoversthedeterminationofmolecularmass(MM)averagesandthedistributionofmolecularmassesforlinearatacticpolystyreneofnarrowmolecularmassdistribution(MMD)ranginginmolecularmassesfrom2000g/molto35000g/molbymatrixassistedlaserdesorption/ionizationtime-of-flightmassspectrometry(MALDI-TOF-MS).Thistestmethodisnotabsoluteandrequirestheuseofbiopolymersforthecalibrationofthemassaxis.TherelativecalibrationoftheintensityaxisisassumedtobeconstantforanarrowMMD.Generally,thisisviewedascorrectifthemeasuredpolydispersityislessthan1.2forthemolecularmassrangegivenabove.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note1ThereisnosimilarorequivalentISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:7P.;A4
【正文语种】: