1、Designation:D567095(Reapproved 2019)Standard Test Method forRubberDetermination of Residual Unsaturation inHydrogenated Nitrile Rubber(HNBR)by InfraredSpectrophotometry1This standard is issued under the fixed designation D5670;the number immediately following the designation indicates the year ofori
2、ginal 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 the percentage of residualunsaturation(double
3、 bonds in unhydrogenated butadiene)inhydrogenated nitrile rubber and is based on infrared examina-tion of rubber films cast from solution.1.2 This test method is applicable to all grades of hydroge-nated nitrile rubber in the raw state.1.3 This test method assumes that specimens and infraredspectra
4、are prepared and analyzed by experienced personneland that the equipment is operated according to the manufac-turers direction for optimum performance.No details foroperation of infrared spectrophotometers are included in thistest method.1.4 Since it is customary in infrared spectrophotometry touse
5、wavenumbers(cm1)rather than Hertz(Hz),the unit forfrequency in the SI system,the former is employed throughoutthis test method.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all
6、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.1.7 This international standard was developed in accor
7、-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 Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Sta
8、ndards:2D4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesE932 Practice for Describing and Measuring Performance ofDispersive Infrared SpectrometersE1421 Practice for Describing and Measuring Performanceof Fourier Transform Mid-Inf
9、rared(FT-MIR)Spectrom-eters:Level Zero and Level One Tests3.Summary of Test Method3.1 Aspecimen of the raw rubber is purified by precipitationwith methanol from a solution in methyl ethyl ketone or byextraction of the solid rubber with methanol in a Soxhletapparatus.3.2 The purified rubber specimen
10、is again dissolved inmethyl ethyl ketone and a film is cast on a potassium bromide(KBr)disc.3.3 The infrared spectrum of the film is obtained with aFourier Transform Infrared Spectrophotometer(FT-IR)or adispersive infrared spectrophotometer.3.4 The corrected absorbance of the specific absorptionband
11、s for acrylonitrile(ACN),butadiene(BD),and hydroge-nated butadiene(HBD)are determined using the baselinemethod and the percentage of residual unsaturation(doublebonds in unhydrogenated butadiene)is calculated with the aidof absorbance factors from the referenced literature.34.Significance and Use4.1
12、 Hydrogenated nitrile rubbers are available at differentlevels of unsaturation and different acrylonitrile content.Highly saturated grades offer optimum resistance to aging,1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand Rubber-like Materials and is the direct responsi
13、bility of Subcommittee D11.11on Chemical Analysis.Current edition approved Jan.1,2019.Published February 2019.Originallyapproved in 1995.Last previous edition approved in 2014 as D5670 95(2014).DOI:10.1520/D5670-95R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM
14、Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Brck,D.,Kautschuk,Gummi,Kunststoffe,Vol 42,1989,pp.107110 and194197.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocke
15、n,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 Standards,Guides and Recommendations issued by the World Trade Organization
16、 Technical Barriers to Trade(TBT)Committee.1 such as exposure to heat,ozone,and chemicals,and can beeffectively cured 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 an infrared technique todetermine the unsaturation level of hydrogenated nitrile rub-bers in the raw state.It can be used for research anddevelopment,quality control,and referee purposes.5.Appa
