1、Designation: D 5666 95 (Reapproved 2004)e1Standard Test Method forRubber Chemical AntidegradantsPurity ofp-Phenylenediamine (PPD) Antidegradants by HighPerformance Liquid Chromatography1This standard is issued under the fixed designation D 5666; the number immediately following the designation indic
2、ates 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 (e) indicates an editorial change since the last revision or reapproval.e1NOTEThe title was revised editorially in December 20
3、04.1. Scope1.1 This test method covers the purity of Type I, II, and IIIp-phenylenediamine (PPD) antidegradants as described inPractice D 4676 by high performance liquid chromatography(HPLC) using ultraviolet detection and external standardcalculations.1.2 Expertise in HPLC is necessary to the succe
4、ssful appli-cation of this test method.1.3 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 and health practices and determine the applica-bility of regulatory l
5、imitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 3853 Terminology Relating to Rubber and RubberLaticesAbbreviations for Chemicals Used in Com-poundingD 4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesD 4676 Cla
6、ssification for Rubber CompoundingMaterialsAntidegradants2.2 ISO Standards:3ISO 5725 Precision of Test MethodsISO 6472 Rubber Compounding IngredientsAbbreviations3. Terminology3.1 Definitions:3.1.1 external standard calculationa method of calculat-ing the percent composition by measuring the area of
7、 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 production unit, normally referred to as the sample.3.1.3 specimenthe a
8、ctual material used in the analysis,also known as the test portion. It must be representative of thelot sample.3.2 Abbreviations: The following abbreviations are in ac-cordance with Terminology D 3853 and ISO 6472:3.2.1 77PDN,N8 bis-(1,4-dimethylpentyl)-p-phenylene-diamine.3.2.2 DTPDN,N8-ditolyl-p-p
9、henylenediamine.3.2.3 IPPDN-isopropyl-N8-phenyl- p-phenylenediamine.3.2.4 PPDp-phenylenediamine.3.2.5 6PPDN-(1,3 dimethylbutyl)-N8-phenyl-p-phenyl-enediamine.4. Summary of Test Method4.1 A specimen is dissolved in acetonitrile and a fixed loopvolume is analyzed by isocratic HPLC using a thermostated
10、C18 reversed phase column and an ultraviolet (UV) detector.Peak areas are determined using a chromatographic integratoror 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-phen
11、ylenediamine antidegradants.1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.11 on Chemical Analysis.Current edition approved Dec. 1, 2004. Published December 2004. Originallyapproved in 1995. Last previous edition approv
12、ed in 2000 as D 5666 - 95 (2000).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 the standards Document Summary page onthe ASTM website.3Available from American Nat
13、ional Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 Since the results of this test method are based on anintegrated peak area as determined by HPLC, it is
14、 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 Chrom
15、atograph, consisting of the following:7.1.1 Precision chromatographic pump,7.1.2 Variable wavelength UV detector,7.1.3 A method for thermostating the column at 35 6 1C,for example, a column oven or water jacket,7.1.4 A fixed injector made of either a 20 mm3(L)rheodyne loop or an automatic sampler.7.
16、2 HPLC Columns, consisting of:7.2.1 A precolumn packed with C18 grafted silica withparticle size of 35 to 40 m (100 to 150 mm), and7.2.2 A column of 10- to 15-cm length packed with C18grafted silica with particle size of 3 to 5 m.7.3 Integrator/Data System, capable of determining abso-lute amounts o
17、f analyte of interest by means of integration ofdetector output versus time.7.4 Analytical Balance, capable of measuring within 60.01mg.7.5 Shaking Machine, or ultrasonic tank.7.6 Volumetric Flask, 100 cm3.7.7 Syringes, with rheodyne loop, 2 cm3.7.8 Clear Screw-Top Vials, with suitable septa, 125 cm
18、3.8. Reagents and Materials8.1 Acetonitrile, HPLC grade.8.2 Ethanolamine, HPLC grade.8.3 Water, HPLC grade or double distilled water or water ofresistivity greater than 2 megohms/cm.9. Calibration and Standardization9.1 Aprimary standard of known purity is used to determinethe response factor for ea
19、ch analyte.10. Procedure10.1 Chromatographic Conditions:10.1.1 Determine the eluant phase composition and the flowrate by adjusting the chromatographic parameters for theparticular column chosen. The eluant phase consists of theappropriate mixture of HPLC grade acetonitrile and HPLCgrade or equivale
20、nt water, both containing 0.2 kg/m3(g/L)ethanolamine or less according to the product to be tested.NOTE 1Different liquid chromatography columns may exhibit differ-ent elution characteristics. See Table 1 for suggested chromatographicstarting parameters for analysis.10.2 DetectorMonitor the absorban
21、ce of the sample at theprescribed wavelength. The detector should be set to 1 absor-bance unit full scale (AUFS).10.3 Integrator/Data SystemThe integrator settingsshould be adjusted to give a full-scale response to 1 absorbanceunit (AU).10.4 Sample Storage Before AnalysisSamples must al-ways be stor
22、ed in a refrigerator.10.5 Standard PreparationWeigh the clear vial to thenearest 0.1 mg, introduce approximately 20 mg of the standardusing a spatula and weigh the standard and vial to the nearest0.1 mg. Using a volumetric flask, add 100 cm3of acetonitrileto the vial. Stopper the vial so that it is
23、hermetically sealedimmediately after adding the solvent. Dissolve the product at23 6 3C in the ultrasonic bath tank or on the shakingmachine. The standard must be analyzed within4hofbeingprepared.NOTE 2Preparation of StandardsThe analytical standards are pre-pared by multiple recrystallizations or d
24、istillations of the paraphenylene-diamines. The procedure can be repeated until the desired purity isobtained. The purity of the standard is estimated by gradient HPLCanalysis of the impurities and differential thermal analysis (DTA). Theimpurities in the standard should be reestimated every 90 days
25、 by HPLC.The standard should be stored at 5C or lower.10.6 Sample PreparationTo ensure sample homogeneity,5 g of sample should be ground with a mortar and pestle.10.7 Sample Analysis:10.7.1 Weigh at least 20 mg to the nearest 0.1 mg of thesample in a clear vial and dissolve it in 100 cm3acetonitrile
26、following the procedure in 10.5. The sample must be analyzedwithin4hofbeing prepared.10.7.2 Injection of the Solutions:10.7.2.1 Manual MethodTake approximately 100 L ofthe solution using a syringe and inject a quantity greater thanthe volume of the rheodyne loop, that is, approximately 60 lfor a 20-
27、l loop. Rinse the syringe with solvent and dry.10.7.2.2 Automatic MethodPut the flasks containing thesample and standard solutions in place and program theautomatic sampler.10.7.3 Chromatograph the samples using parameters asprescribed in 10.1.1.11. Calculation11.1 Response FactorCalculate the respo
28、nse factor for thestandard by dividing the concentration of the standard by themeasured area count and multiplying this by the purity of thestandard:RF 5concentration/area count!3% purity (1)NOTE 3Throughout the calculation the units of concentration must beconsistent (that is, kg/m3(mg/cm3).11.2 Pr
29、oduct PurityTo determine the purity of the prod-uct, multiply the response factor by the measured area count ofthe analyte and divide by the sample concentration:TABLE 1 Suggested Chromatographic Starting ParametersN,N8-dialkyl-paraphenylene-diamine77-PPDN-aryl-N8-alkyl-paraphenylene-diamineIPPD6-PP
30、DN,N8-diaryl-paraphenylene-diamineDPPDDTPDEluant phase% acetonitrile 85 65 70% Water 15 35 30Ethanolamine (g/L) 0.2 0.1 0.1Flow rate (cm3/min) 1 1 1Wavelength (nm) 260 290 280D 5666 95 (2004)e12% purity 5 RF 3 area count/sample concentration (2)12. Report12.1 Report percent paraphenylenediamine to t
31、he nearest0.1 %.13. Precision and Bias413.1 This precision and bias section has been prepared inaccordance with Practice D 4483. Refer to Practice D 4483 forterminology and other statistical details.13.1.1 The precision results in this precision and biassection give an estimate of the precision of t
32、his test methodwith the materials used in the particular interlaboratory pro-grams as described below. The precision parameters should notbe used for acceptance/rejection testing of any group ofmaterials without documentation that they are applicable tothose particular materials and the specific tes
33、ting protocols thatinclude this test method.13.2 These precision and bias data were obtained in aninterlaboratory test organized in France in 1992. In thisprogram one material was analyzed by 13 different laborato-ries. Six measurements were taken over six days by one tothree operators. Statistical
34、evaluation was carried out in accor-dance with ISO 5725-1986, which is equivalent to the calcu-lation algorithms of Practice D 4483. The results from thisprecision and bias study are given in Table 2.13.3 RepeatabilityThe difference between two single testresults (or determinations) found on identic
35、al test materialunder the repeatability conditions prescribed for a particulartest will exceed the repeatability (r), as given in Table 2,onanaverage of not more than once in twenty cases in the normaland correct operation of the test method.13.4 ReproducibilityThe difference between two singleand i
36、ndependent test results found by two operators workingunder prescribed reproducibility (R) conditions in differentlaboratories on identical test material will exceed the repro-ducibility (R), as given in Table 2, on an average of not morethan once in twenty cases in the normal and correct operationo
37、f the test method.13.5 BiasSample impurities that are not resolved from theanalyte of interest will produce a falsely high result. There maybe other sources of bias that have not been determined.14. Keywords14.1 antidegradant; high performance liquid chromatogra-phy; N-isopropl-N8-phenyl-p-phenylene
38、diamine (IPPD); N-(1,3 dimethylbutyl)-N8-phenyl-p-phenylenediamine (6PPD); N,N8 bis-(1, 4-dimethylpentyl)-p-phenylenediamine (77PD); N,N8-ditolyl-p-phenylenediamine (DTPD); p-phenylenediamine(PPD)APPENDIX(Nonmandatory Information)X1. RECOMMENDATIONSX1.1 De-gas the eluents.X1.2 Use an appropriate gua
39、rd column.X1.3 Acid-clean the glassware.X1.4 Keep the temperature of the samples and standard thesame.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that de
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42、hat your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprint
43、s (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).4Supporting data have been filed at ASTM International Headquarters and maybe o
44、btained by requesting Research Report RR: D11-1063.TABLE 2 Precision (Type 1)Paraphenylenediamine PurityMaterialMeanAlevelWithin laboratoriesBBetween laboratoriesBSrr (r) SRR (R)6PPD 95.27 0.335 0.948 0.995 0.441 1.248 1.31AMean level values (in percent).BSymbols are defined as follows:Sr= within laboratory standard deviation,r = repeatability (in measurement units),(r) = repeatability (in percent),SR= between laboratory standard deviation,R = reproducibility (in measurement units),(R) = reproducibility (in percent)D 5666 95 (2004)e13
