1、Designation:D557600(Reapproved 2021)1Standard Practice forDetermination of Structural Features in Polyolefins andPolyolefin Copolymers by Infrared Spectrophotometry(FT-IR)1This standard is issued under the fixed designation D5576;the number immediately following the designation indicates the year of
2、original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTETable 1 was editorially updated in January and the epsilon note was adde
3、d in February 2021.1.Scope*1.1 This practice covers infrared procedures for determiningthe molecular structural features in polyolefins and polyolefincopolymers.The structural features of primary concern are thetypes and numbers of branches.Although this practice centersits attention on polyolefins
4、and polyolefin copolymers,thetechniques,with proper modification,can be used for someother polymers as well.NOTE1Quantitative determinations require either an internal or anexternal evaluation of sample thickness.ASTM test methods available forspecific features are listed in Tables 1 and 2.1.2 This
5、standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.NOTE2There is
6、 no known ISO equivalent to this standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the Worl
7、d Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2238 Test Methods forAb
8、sorbance of Polyethylene Due toMethyl Groupsat 1378 cm1(Withdrawn 2021)3D3124 Test Method for Vinylidene Unsaturation in Polyeth-ylene by Infrared SpectrophotometryD3594 Test Method for Copolymerized Ethyl Acrylate InEthylene-Ethyl Acrylate Copolymers(Withdrawn 2019)3D5594 Test Method for Determinat
9、ion of the Vinyl AcetateContent of Ethylene-Vinyl Acetate(EVA)Copolymers byFourier Transform Infrared Spectroscopy(FT-IR)D6248 Test Method for Vinyl and Trans Unsaturation inPolyethylene by Infrared Spectrophotometry(Withdrawn2021)3E131 Terminology Relating to Molecular SpectroscopyE168 Practices fo
10、r General Techniques of Infrared Quanti-tative AnalysisE932 Practice for Describing and Measuring Performance ofDispersive Infrared SpectrometersE1421 Practice for Describing and Measuring Performanceof Fourier Transform Mid-Infrared(FT-MIR)Spectrom-eters:Level Zero and Level One TestsIEEE/ASTM SI-1
11、0 Standard for Use of the InternationalSystem of Units(SI):The Modern System3.Terminology3.1 DefinitionsFor definitions of plastics terms used inthis practice see Terminology D883 and D1600.3.2 Units,symbols and abbreviations used in this practiceappear in Terminology E131 or IEEE/ASTM SI-10.4.Summa
12、ry of Practice4.1 Infrared absorption bands suitable for quantitativeanalysis by FT-IR are listed in Tables 1 and 2.These are onlytypical bands and are not to be construed as exhaustive.1This practice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subco
13、mmittee D20.70 on Analytical Methods.Current edition approved Jan.15,2021.Published January 2021.Originallyapproved in 1994.Last previous edition approved in 2013 as D5576-00(2013).DOI:10.1520/D5576-00R21E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer S
14、ervice at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright
15、 ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Stand
16、ards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.2 For quantitative determinations,sample specimen thick-ness is measured internally at some band representing the basicchain structure,such as 2019 cm1for polyethylene,orexternally using a micrometer(see Tables 1 and 2 for ASTMtest methods).NOTE3Warning:Molding can cause carbonyl formation due tooxidation.This should be checked in the 1700 to 1750 cm1range.5.Significance and Use5.1
