1、Designation:D590205(Reapproved 2019)Standard Test Method forRubberDetermination of Residual Unsaturation inHydrogenated Nitrile Rubber(HNBR)by Iodine Value1This standard is issued under the fixed designation D5902;the number immediately following the designation indicates the year oforiginal adoptio
2、n 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 the Wiijs procedure for thedetermination of unsaturation(i
3、odine value)in hydrogenatednitrile rubbers.1.2 This test method is applicable only to those hydroge-nated nitrile rubbers derived from copolymers of acrylonitrileand butadiene.1.3 Iodine values are reported in centigrams of iodine pergram of HNBR cg(I2)/g.Higher iodine values indicate higherlevels o
4、f unsaturation.1.4 This test method is appropriate for calculating thepercent residual unsaturation of hydrogenated nitrile rubber ifthe iodine value of the base polymer before hydrogenation hasbeen determined.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurem
5、ent are included in thisstandard.1.6 This 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 regulat
6、ory limitations prior to use.1.7 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 World Trade Organ
7、ization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD1959 Test Method for Iodine Value of Drying Oils andFatty Acids(Withdrawn 2006)3D4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon B
8、lack ManufacturingIndustries3.Summary of Test Method3.1 Asample of the raw,unvulcanized rubber is dissolved inchloroform.3.2 The dissolved sample is reacted with Wiijs solution.3.3 When the reaction is completed,potassium iodide solu-tion is added.3.4 The resultant solution is then back-titrated wit
9、h sodiumthiosulfate solution and the iodine value is calculated.4.Significance and Use4.1 Hydrogenated nitrile rubbers are available at differentlevels of unsaturation and different acrylonitrile content.Highly saturated grades offer optimum resistance to aging,such as exposure to heat,ozone and che
10、micals,and can becured effectively only with peroxides or high energy radiation.4.2 Partially unsaturated grades can be cured by sulfursystems in addition to peroxides and high energy radiation.4.3 This test method provides a technique to determine theunsaturation level of hydrogenated nitrile rubbe
11、rs in the raw,unvulcanized state.It can be used for research anddevelopment,quality control,and referee purposes.5.Apparatus5.1 Erlenmeyer Flasks,with ground glass stoppers(300mL).5.2 Flask Shaker.5.3 Pipets.5.4 Constant Temperature Bath.1This test method is under the jurisdiction of ASTM Committee
12、D11 on Rubberand Rubber-like Materials and is the direct responsibility of Subcommittee D11.11on Chemical Analysis.Current edition approved Dec.1,2019.Published December 2019.Originallyapproved in 1996.Last previous edition approved in 2015 as D5902 05(2015).DOI:10.1520/D5902-05R19.2For referenced A
13、STM standards,visit the ASTM website,www.astm.org,orcontact ASTM 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
14、.Copyright 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 Internati
15、onal Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.6.Reagents6.1 Reagent grade chemicals shall be used in all tests.Allreagents shall conform to the specifications of the Committeeon Analytical Reagents of the American Chemical
16、Society.4Other grades may be used,provided it is first ascertained thatthe reagent is of sufficiently high purity to permit its usewithout lessening the accuracy of the determination.6.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Type I of Specification D1193.6.3 Chloroform.6.4 Wiijs Solution(prepared in accordance with Test MethodD1959).6.5 Potassium Iodide Solution(prepared in accordance withTest Method D1959).6.6 0.1 N S
