1、Designation:D359493(Reapproved 2013)Standard Test Method forCopolymerized Ethyl Acrylate In Ethylene-Ethyl AcrylateCopolymers1This standard is issued under the fixed designation D3594;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,t
2、he 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 ethylene-ethyl acrylate copoly-mers containing from 1 to 25%ethyl acrylate comonomer.1.2
3、 The values stated in SI units are to be regarded asstandard.(See IEEE/ASTM SI-10.)1.3 This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and det
4、ermine the applica-bility of regulatory limitations prior to use.NOTE1There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1898 Practice for Sampling of Plastics(Withdrawn 1998)3E131 Terminology Relating to Molecular Spectr
5、oscopyE168 Practices for General Techniques of Infrared Quanti-tative AnalysisE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible SpectrophotometersIEEE/ASTM SI-10 Standard for Use of the Internatio
6、nalSystem of Units(SI):The Modern Metric System3.Terminology3.1 See Terminology D883.4.Summary of Test Method4.1 The infrared absorption band at 11.60 m responds toincreases in comonomer content.There is no absorption at thiswavelength when there is no comonomer present.It apparentlyis unique and ch
7、aracteristic of the copolymer.There is nointerference from the monomer at this wavelength.4.2 The infrared absorption band at 11.60 m is of mediumintensity;consequently,fairly thick films are employed.This isan advantage in that errors in measurements of the thicknessesof films have minimal influenc
8、e on the analytical result.Filmthickness is selected so that not more than 80%of the infraredenergy is absorbed at the analytical wavelength.The approxi-mate thicknesses found to be satisfactory for different concen-trations of comonomer are as follows:(1)less than 5 weight%ethyl acrylate=0.5 mm,(2)
9、5 to 15 weight%ethyl acry-late=0.25 mm,and(3)15 to 25 weight%ethyl acry-late=0.18 mm.It is necessary first to press a film approxi-mately 0.25 mm in thickness and scan it to observe theabsorption intensity unless the approximate ethyl acrylatecontent is known.4.3 For the highest precision,the test m
10、ethod requires thatthe thickness of the sample film be determined accurately.4.4 The general procedure is to scan the absorption bandfrom 10.50 to 12.50 m,although a single-point measurementmay also be used.This test method describes the use of a scanand employs the base-line method as outlined in 7
11、.2 and thefigure illustrating the Base-Line Method for Measuring Absor-bance of Practices E168.A calibration curve is prepared byplotting absorbance per millimetre values versus weight per-cent ethyl acrylate for several copolymers which have hadethyl acrylate contents established by a fast neutron
12、activationanalysis of oxygen content.The ethyl acrylate content of anunknown sample is then obtained by referring the absorbanceper millimetre value to the calibration curve.5.Significance and Use5.1 Ethyl acrylate is copolymerized with ethylene to pro-duce film,molding,and wire coating resins with
13、improvedphysical properties.Ethyl acrylate comonomer increasesflexibility,stress cracking resistance,toughness,and clarity.Arapid quantitative technique is needed for the evaluation of the1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of
14、 Subcommittee D20.70 on Analytical Meth-ods.70.08).Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1977.Last previous edition approved in 2006 as D3594-93(2006).DOI:10.1520/D3594-93R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM
15、Customer Service 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,W
16、est Conshohocken,PA 19428-2959.United States1 amount of ethyl acrylate in a resin for specification purposesbecause physical properties change rapidly with increasingcomonomer content.5.2 Infrared spectrophotometric analysis,when suitablycalibrated,can be used for the measurement of the concentra-tion of comonomer present.Calibration is performed withsamples that have been analyzed for oxygen content by fastneutron activation analysis.Oxygen content is converted toethyl acrylate comonomer conten
