1、Designation:D559498(Reapproved 2012)Standard Test Method forDetermination of the Vinyl Acetate Content of Ethylene-VinylAcetate(EVA)Copolymers by Fourier Transform InfraredSpectroscopy(FT-IR)1This standard is issued under the fixed designation D5594;the number immediately following the designation i
2、ndicates the year oforiginal 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.1.Scope1.1 This test method covers infrared procedures fo
3、r deter-mining the vinyl acetate content of EVA copolymers usingpressed films(Procedure A)or molded plaques(Procedure B)and internal corrections for sample thickness.1.2 This test method is applicable to the analysis of EVAcopolymers containing 0.5 to 55%vinyl acetate except asspecified in 1.3.1.3 T
4、alc interferes with the 1020 cm1vinyl acetate band.Resins containing 5%vinyl acetate and talc are excludedfrom the scope of this test method.1.4 The values stated in SI units are to be regarded as thestandard.The values given in brackets are provided forinformation purposes only.1.5 This standard do
5、es 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 and health practices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are
6、 given in Section 8.NOTE1This test method is not equivalent to ISO 8985.2.Referenced Documents2.1 ASTM Standards:2E131 Terminology Relating to Molecular SpectroscopyE168 Practices for General Techniques of Infrared Quanti-tative AnalysisE177 Practice for Use of the Terms Precision and Bias inASTM Te
7、st MethodsIEEE/ASTM SI-10 Use of the International System of Units(SI):The Modem Metric SystemE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 8985PlasticsEthylene/Vinyl Acetate CopolymerThermoplasticsDetermination of Vinyl Acetate3
8、,43.Terminology3.1 Definitions:3.1.1 Units,symbols,and abbreviations used in this testmethod appear in Terminology E131 or IEEE/ASTM SI-10.3.2 Abbreviations:3.2.1 EVAethylene-vinyl acetate copolymer.3.2.2 PTFEtetrafluorethylene polymer.3.2.3 FT-IRFourier transform infrared.4.Summary of Test Method4.
9、1 The vinyl acetate content is measured using infraredabsorption band at 1020 cm1(0.5 to 5%vinyl acetate)or 609cm1(5 to 55%vinyl acetate).4.2 Sample thickness is measured internally using an ethyl-ene infrared absorption band at 720 cm1(28 to 55%vinylacetate),2020 cm1(0.5 to 28%vinyl acetate),or 425
10、0 cm1(5 to 28%vinyl acetate).4.3 Regression analysis is performed on vinyl acetate/ethylene ratios versus known vinyl acetate contents for EVAcopolymer standards.The resulting equation is used to calcu-late the vinyl acetate content for subsequent EVA copolymersamples.5.Significance and Use5.1 Prope
11、rties of EVA copolymers are affected by theamount of vinyl acetate incorporated in the copolymer:This1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.70 on Analytical Methods.Current edition approved April 1,2012.Publis
12、hed June 2012.Originallyapproved in 1994.Last previous edition approved in 2004 as D5594-98(2004).DOI:10.1520/D5594-98R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to
13、 the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Nicolet 20 S B,available from Nicolet Instrument Corp.,Analytical Division,5225 Verona Rd.,Madison,WI 53711-4495,and Perki
14、n Elmer 1760,a registeredtrademark of Perkin-Elmer Corp.,761 Main Ave.,Norwalk,CT 06859-0156,orequivalents,have been found suitable for this purpose.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19
15、428-2959.United States1 test method provides a means to determine the vinyl acetatelevel in copolymer samples.5.2 Before proceeding with this test method,referenceshould be made to the specification of the material being tested.Any test specimen preparation,conditioning,dimensions,ortesting paramete
16、rs,or a combination thereof,covered in thematerials specification shall take precedence over those men-tioned in this test method.If there are no materialspecifications,then the default conditions apply.6.Apparatus6.1 Fourier Transform Infrared(FT-IR)Spectrophotometer,equipped with a detector,which gives a linear response overthe desired concentration range,is capable of 4-cm2resolution(nominal),and is able to scan from 4400 to 450 cm1.NOTE2ADTGS detector has been found suitable for this applica
