【英文标准名称】:Plastics-Determinationofspecificvolumeasafunctionoftemperatureandpressure(pVTdiagram)-Pistonapparatusmethod
【原文标准名称】:塑料.作为温度和压力函数的比容的测定(pvT图).活塞装置法
【标准号】:BSISO17744-2004
【标准状态】:现行
【国别】:英国
【发布日期】:2004-12-08
【实施或试行日期】:2004-12-08
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:松密度测定(纸张);塑料;体积;容积测量;温度性能;试验;聚酯;压力性能;体积膨胀;定义
【英文主题词】:Bulkdetermination(paper);Definition;Definitions;Plastics;Polyesters;Pressurebehaviour;Temperaturebehaviour;Testing;Volume;Volumeexpansion;Volumemeasurement
【摘要】:ThisInternationalStandarddescribesproceduresfordeterminingthespecificvolumeofplasticsasafunctionoftemperatureandpressureinboththemoltenandsolidstates.Thestandardspecifiestheuseofapiston-equippedapparatusinwhichthetestsample,heldinameasurementcell,ispressurizedbymeansofthepiston.Measurementsunderconditionsofconstantpressureorconstanttemperaturecanbemade.Intheconstant-pressuremode,themaximumheatingandcoolingratespermissiblearerestrictedto5℃/min.NOTEHigherheatingandcoolingratescanbeused,butdatawillthenhavetobecorrectedforthermalgradients[13].Fortheacquisitionofdataneededforprocessingdesign,itisrecommendedthattheisobariccoolingmethodbeused(seeISO17282).Theresultofthismeasurementcannotbeuseddirectlyforinjection-mouldingsimulation.Byusingtheseprocedures,itispossibletoobtain:—pvTdiagramsthatrepresenttherelationshipwhichexistsbetweenpressure,specificvolumeandtemperatureforagivenmaterial;—compressibilityandvolumetricthermal-expansioncoefficients;—informationonfirst-orderandglasstransitionsasafunctionoftemperatureandpressure.Althoughthermoplasticpolymersarecurrentlytesteddowntoroomtemperatureusingtheseprocedures,itisemphasizedthat,attemperatureslowerthanTg,thedifficultyinachievingatruehydrostaticstateisasourceofuncertaintyonthespecificvolumemeasurement.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:28P.;A4
【正文语种】:英语