【英文标准名称】:StandardTestMethodforVinylandTransUnsaturationinPolyethylenebyInfraredSpectrophotometry
【原文标准名称】:用红外线分光光度法对乙烯基和横相不饱和性的标准试验方法
【标准号】:ASTMD6248-1998(2004)
【标准状态】:现行
【国别】:
【发布日期】:1998
【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】:红外分光光度法;聚乙烯;横向乙烯集不饱和性;乙烯基不饱和
【英文主题词】:FTIR;infraredspectrophotometry;polyethylene;transvinyleneunsaturation;vinylunsaturation
【摘要】:Therearethreetypesofolefinicgroupspresentinsufficientconcentrationstowarrantconsideration,oneormoreofthatcannormallybefoundinanypolyethylene.Thethreetypesaretrans-vinylene,R-CH=CH-Rx2032;,sometimesreferredtoastrans-internalunsaturation;vinylideneorpendentmethylene,RRx2032;C-CH2;andvinylunsaturation,R-CH=CH2,alsoreferredtoasterminalunsaturation.Thetypeandquantityofthesegroupscaninfluencethechemicalandphysicalpropertiesoftheresin.Informationconcerningtheirpresencemayalsobeusedtocharacterizeoridentifyunknownresinsorblendsofresins.Additivesmayinterferewithunsaturationmeasurements.Theuseiscautionedtodeterminewhichadditivesarepresentandifthereanyabsorbancebandscausedbyadditivepresencethatoverlaporinterferewithunsaturationabsorbancebandsusedinthistestmethodintherangeof1050to850cmx2013;1.Ifoverlappingbandsoccur,themethodisnotapplicable.Interferencefringesresultingfromsmoothsamplesurfacescancausemeasurementerrors.Thistestmethodrequirestheuseofaluminumfoilinthecompressionmoldingofsamplestoprovideanadequatelyroughsurfacetominimizeinterferencefringes.1.1Thistestmethodcoversmosttypesofpolyethylene,thoseethyleneplasticsconsistingofethyleneand-olefincomonomerslongerthanpropylene,andblendsoftheaboveinanyratio.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardsstatementsaregiveninSection8.Note18212;ThereisnosimilarorequivalentISOstandard.
【中国标准分类号】:G16
【国际标准分类号】:83_080_20
【页数】:3P.;A4
【正文语种】: