1、Designation:D566695(Reapproved 2019)Standard Test Method forRubber Chemical AntidegradantsPurity ofp-Phenylenediamine(PPD)Antidegradants by HighPerformance Liquid Chromatography1This standard is issued under the fixed designation D5666;the number immediately following the designation indicates the y
2、ear 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 the purity of Type I,II,and IIIp-phe
3、nylenediamine(PPD)antidegradants as described inClassification D4676 by high performance liquid chromatog-raphy(HPLC)using ultraviolet detection and external standardcalculations.1.2 Expertise in HPLC is necessary to the successful appli-cation of this test method.1.3 The values stated in SI units a
4、re to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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 environmenta
5、l practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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,Guid
6、es and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3853 Terminology Relating to Rubber and RubberLaticesAbbreviations for Chemicals Used in Com-poundingD4483 Practice for Evaluating Precision for Test Met
7、hodStandards in the Rubber and Carbon Black ManufacturingIndustriesD4676 Classification for Rubber Compounding MaterialsAntidegradants2.2 ISO Standards:3ISO 5725 Precision of Test MethodsISO 6472 RubberCompoundingIngredientsAbbreviations3.Terminology3.1 Definitions:3.1.1 external standard calculatio
8、na method of calculat-ing the percent composition by measuring the area of theanalyte peak,multiplying by a response factor,and dividing bythe sample concentration.All components are assumed to beresolved from the component of interest.3.1.2 lot samplea production sample representative of astandard
9、production unit,normally referred to as the sample.3.1.3 specimenthe actual material used in the analysis,also known as the test portion.It must be representative of thelot sample.3.2 Abbreviations:3.2.1 The following abbreviations are in accordance withTerminology D3853 and ISO 6472:3.2.2 77PDN,N b
10、is-(1,4-dimethylpentyl)-p-phenylene-diamine.3.2.3 DTPDN,N-ditolyl-p-phenylenediamine.3.2.4 IPPDN-isopropyl-N-phenyl-p-phenylenediamine.3.2.5 PPDp-phenylenediamine.3.2.6 6PPDN-(1,3 dimethylbutyl)-N-phenyl-p-phenyl-enediamine.4.Summary of Test Method4.1 A specimen is dissolved in acetonitrile and a fi
11、xed loopvolume is analyzed by isocratic HPLC using a thermostatedC18 reversed phase column and an ultraviolet(UV)detector.Peak areas are determined using a chromatographic integrator1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand Rubber-like Materials and is the direct
12、 responsibility 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 D5666 95(2014).DOI:10.1520/D5666-95R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcont
13、act ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to 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.Copyright ASTM International,100 Barr
14、 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 Standards,Guides and Recommendati
15、ons issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 or laboratory data system with the amount of analyte beingdetermined by external calibration.5.Significance and Use5.1 This test method is designed to determine the purity ofp-phenylenediamine antidegradants.5.2 S
16、ince the results of this test method are based on anintegrated peak area as determined by HPLC,it is assumed thatall analytes of interest are resolved from interfering peaks.6.Interferences6.1 Components co-eluting with the analyte of interest willcause erroneous results;thus it is required that the system becapable of providing a minimum of 10 000 theoretical plates.7.Apparatus7.1 Liquid Chromatograph,consisting of the following:7.1.1 Precision chromatographic pump,7.1.2 Variable wavelength UV
