基本信息
| 标准名称： | 工业自动化仪表通用试验方法 电源瞬时过压影响 |
| 中标分类： |
仪器、仪表 >>
工业自动化仪表与控制装置 >>
工业自动化与控制装置综合 |
| 替代情况： | 替代ZB Y092-82;被JB/T 6239.5-2007替代 |
| 发布部门： | 上海工业自动化仪表所 |
| 发布日期： | 1992-05-27 |
| 实施日期： | 1993-04-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2008-03-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 2 页 |
适用范围
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前言
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引用标准
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所属分类： 仪器 仪表 工业自动化仪表与控制装置 工业自动化与控制装置综合
【英文标准名称】:StandardTestMethodforMolecularWeightAveragesandMolecularWeightDistributionofPolystyrenebyHighPerformanceSize-ExclusionChromatography
【原文标准名称】:用高效粒度排除色谱法测定聚苯乙烯平均分子量和分子量分布的标准试验方法
【标准号】:ASTMD5296-2005
【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】:试验;塑料;聚苯乙烯
【英文主题词】:high-performancesizeexclusionchromatography(HPSEC);molecularweightaverage;molecularweightdistribution;polystyrene
【摘要】:GeneralUtility8212;Themolecularweight(MW)andmolecularweightdistribution(MWD)arefundamentalcharacteristicsofapolymersample.Theymaybeusedforawidevarietyofcorrelationsforfundamentalstudies,processing,orproductapplications.Forexample,theobservedMWDmaybecomparedtoonepredictedfromassumedkineticsormechanismsforapolymerizationreaction.Differencesbetweenthevalueswillallowalterationoftheoryorexperimentaldesign.Similarly,thestrength,meltflow,andotherpropertiesofapolymersamplemaybedependentonMWandMWD.DeterminationsofMWandMWDareusedforqualitycontrolofpolymers.Limitations8212;Becauseoftheneedforspecificcalibrationofthepolymertypeunderstudy,andbecauseofthespecificnatureofpolymer/solvent/column-packinginteractions,thistestmethodisvalidonlyforpolystyreneandnon-exclusioneffectsaretobeavoided.However,manyoftheprinciplesofthemethodmaybeappliedingeneratingHPSECmethodsforotherpolymersystems,forexample,usingtheprinciplesofuniversalcalibration.(seePracticeD3016).1.1Thistestmethodcoversthedeterminationofmolecularweight(MW)averagesandthedistributionofmolecularweightsforlinear,solublepolystyrenebyliquidhigh-performancesize-exclusionchromatography(HPSEC).Thistestmethodisnotabsoluteandrequirestheuseofcommerciallyavailablenarrowmolecularweightdistribution(MWD)polystyrenestandardsforcalibration.Thistestmethodisapplicableforsamplescontainingmolecularweightcomponentsthathaveelutionvolumesfallingwithintheelutionvolumerangedefinedbypolystyrenestandards(thatis,molecularweightsgenerallyfrom2000to2000000gmol1).1.2TheHPSECisdifferentiatedfromtraditionalsize-exclusionchromatographySEC(alsoreferredtoasgelpermeationchromatography(GPC))inthatthenumberoftheoreticalplatespermetrewithanHPSECsystemisabouttentimesgreaterthanthatfortraditionalSEC(seeTerminologyD883andPracticeD3016).TheHPSECsystemsemploylow-volumeliquidchromatographycomponentsandcolumnspackedwithrelativelysmall(generally3to20m)microporousparticles.High-performanceliquidchromatographyinstrumentationandautomateddatahandlingsystemsfordataacquisitionandprocessingarerequired.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecificprecautionarystatementsaregiveninSection.Note1ThereisnosimilarorequivalentISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:13P.;A4
【正文语种】: