基本信息
| 标准名称： | 新鲜农产品标识通则 |
| 发布日期： | 2007-11-21 |
| 实施日期： | 2007-12-01 |
| 首发日期： | |
| 作废日期： | |
| 主管部门： | 山东省质量技术监督局 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2007-12-01 |
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： 化工技术 化工生产
【英文标准名称】:StandardTestMethodforFlowRatesforPoly(VinylChloride)withMolecularStructuralImplications
【原文标准名称】:聚氯乙烯和流变的不稳定热塑性材料流动速率的测试试验方法
【标准号】:ASTMD3364-1999(2004)
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:D20.30
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:热塑性聚合物;流变性能;流量率;试验;塑料;聚氯乙烯
【英文主题词】:chainshearing;crosslinking;degradation;fragmentation;meltflowrate;poly(vinylchloride);rheology;shearinstability
【摘要】:Thistestmethodisusefulforquality-controltestsonPVCcompoundshavingawiderangeofmeltviscosities.Measurementsaremadeatshearratescloseto1sx2212;1.InadditiontothepropertiesmentionedinTestMethodD1238,thistechniqueissensitivetoplasticizercontent,polymermolecularweight,polymerstability(boththermallyandrheologically),shearinstability,andgeneralcomposition.ThesensitivityofthematerialtotemperaturenecessitatesslightlytightercontrolsthanthosestatedinTestMethodD1238.Thesensitivityofthistestmethodmakesitusefulforcorrelatingwithprocessingconditionsandasanaidinpredictingchangesinprocessing.However,asaone-pointmeasureofflowrelativetoshearrate,itsonedrawbackisthatthesamePVCmeltflowvaluescanbeobtainedformaterialshavingdifferentprocessibility;thechanceofthishappeningisminimized,however,ifthecompoundsaresimilarincomposition.Correlationswithawiderangeofprocessingconditionshavesupportedtheconclusionsthatlittleornochangeincompositionoccursduringthetest.Thus,thistestisabletodetectandfollowprofoundchangeswhichoccurduringextrusion,injectionmolding,milling,ormixing.Thesechangesareduetothreetypesofmeasuredinstabilityinpolymers:5.4.1Thermalinstabilityduetotemperatureeffect.5.4.2Shearinstabilityduetobreakingofpolymerbonds.5.4.3Rheologicalinstabilityduetononuniformdistributionsofwidelydifferentviscosityormolecularweightelements.5.4.4Thus,implicationswithrespecttoPVCmolecularstructuralchangescanbedetectedandpredicted.1.1ThistestmethodisanextensionofTestMethodD1238specifictothemeasurementofflowratesofpoly(vinylchloride)(PVC)compoundswhiledetectingandcontrollingvariouspolymerinstabilitiesassociatedwiththeflowrate.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.ThereisnosimilarorequivalentISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:4P.;A4
【正文语种】: