【英文标准名称】:Determinationoftheviscosityofpolymersindilutesolutionusingcapillaryviscometers-Part2:Poly(vinylchloride)resins
【原文标准名称】:用毛细管粘度计测定稀溶液中聚合物的粘度第2部分:聚氯乙烯树脂
【标准号】:ISO1628-2-1998
【标准状态】:现行
【国别】:国际
【发布日期】:1998-12
【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】:试验;试验;树脂;粘度计;溶剂;稀释;粘度;高聚物;测量技术;测量;溶液;聚氯乙烯;塑料;测定
【英文主题词】:Determination;Dilution;Measurement;Measuringtechniques;Plastics;Polymers;Polyvinylchloride;Resins;Solutions;Solvents;Testing;Vinylchloride;Viscometers;Viscosity;Viscositynumbers
【摘要】:ThispartofISO1628specifiesconditionsforthedeterminationofthereducedviscosity(alsoknownasviscositynumber)andK-valueofPVCresins.Itisapplicabletoresinsinpowderformwhichconsistofhomopolymersofthemonomervinylchlorideandcopolymers,terpolymers,etc.,ofvinylchloridewithoneormoreothermonomers,butwherevinylchlorideisthemainconstituent.Theresinsmaycontainsmallamountsofunpolymerizedsubstances(e.g.emulsifyingorsuspendingagents,catalystresidues,etc.)andothersubstancesaddedduringthecourseofthepolymerization.ThispartofISO1628isnotapplicable,however,toresinshavingavolatile-mattercontentinexcessof0,5%±0,1%,whendeterminedinaccordancewithISO1269.Inadditiontothis,itisnotapplicabletoresinswhicharenotentirelysolubleincyclohexanone.ThereducedviscosityandK-valueofaparticularresinarerelatedtoitsmolecularmass,buttherelationshipvariesdependingontheconcentrationandtype(s)ofothermonomer(s)present.HencehomopolymersandcopolymershavingthesamereducedviscosityorK-valuemaynothavethesamemolecularmass.ThevaluesdeterminedforreducedviscosityandK-value,foraparticularsampleofPVCresin,areinfluenceddifferentlybytheconcentrationofthesolutionchosenforthedetermination.HencetheuseoftheproceduresdescribedinthispartofISO1628willonlygivevaluesforreducedviscosityandK-valuethatarecomparablewhentheconcentrationsofthesolutionsusedareidentical.LimitingviscositynumberisnotusedforPVCresins.TheexperimentalproceduresdescribedinthispartofISO1628canalsobeusedtocharacterizethepolymericfractionobtainedduringthechemicalanalysisofaPVCcomposition.However,thevaluescalculatedforthereducedviscosityandK-valueinthesecircumstancesmaynotindicatetheactualvaluesfortheresinusedtoproducethecompositionbecauseoftheimpurenatureoftherecoveredpolymerfraction.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:14P.;A4
【正文语种】:英语


【英文标准名称】:SpecificationfortheQualificationofWeldingSalesRepresentatives
【原文标准名称】:焊接销售代表资质鉴定规范
【标准号】:ANSI/AWSB5.14-2002
【标准状态】:作废
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Qualifications;Representatives;Salemanagement;Specification;Welding
【摘要】:ThisspecificationdefinestherequirementsforqualificationofWeldingSalesRepresentativesemployedintheweldingindustry.Thetypicalfunctions,requirededucationandexperience,examinationrequirements,requalification,andsuggestedreferencematerialaredefinedherein.
【中国标准分类号】:J33
【国际标准分类号】:25_160_01
【页数】:
【正文语种】:英语