1、Designation:D577595(Reapproved 2014)Standard Test Method forRubberDetermination of Bound Styrene in StyreneButadiene Rubber by Refractive Index1This standard is issued under the fixed designation D5775;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、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 determination of styrenecontent,and is intended for general use on
3、 solid uncom-pounded styrene-butadiene copolymers,commonly referred toas SBR,prepared by the emulsion process.SBR polymersprepared in solution will require the use of different refractiveindex tables because the vinyl content of the butadiene differsfrom that in the emulsion polymers.It is applicabl
4、e to polymershaving less than 55%bound styrene.NOTE1The nomenclature used in this test method is in accordancewith Practice D1418.1.2 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 a
5、ppro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1418 PracticeforRubberandRubberLaticesNomenclatureD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black
6、 ManufacturingIndustries3.Summary of Test Method3.1 A sample of dried ETA-extracted polymer is pressedbetween sheets of aluminum foil to provide sheeted rubberhaving a thickness of not more than 0.50 mm.The boundstyrene content is calculated from the refractive index obtainedat 25C on this thinly sh
7、eeted rubber.4.Significance and Use4.1 The bound styrene test is a measure of the boundmonomeric composition of the rubber.It is used as a check onthe accuracy of monomer charging and also as a guide to theuniformity of the product,since the bound styrene contentaffects the physical properties.5.App
8、aratus5.1 Spiders,consisting of 13-mm squares of sheet alumi-num or stainless steel having a Nichrome wire leg about 38 mmlong attached to each corner.Where the extracting solvent isETA-acidified with HCl,the spider and the legs should bemade of tantalum.5.2 Abbe-Type Refractometer,having fourth dec
9、imal placeaccuracy,whose refracting prism can be placed in a nearlyhorizontal position for measurement of the refractive index ofsolids.AnAmici-type compensating prism for achromatizationis necessary unless a sodium vapor lamp is used as a lightsource.5.3 Vacuum Oven,capable of being evacuated to a
10、pressureof 1.3 kPa(10 mm Hg)and of maintaining a temperature of100C.5.4 Aluminum Foil,between 0.025 and 0.08 mm thick,having good tear strength.5.5 Glass Test Piece,standard,for checking adjustment ofthe refractometer.5.6 Hydraulic Press,that can be maintained at 100C andcan apply a force of at leas
11、t 2.2 kN(500 lbf)on each specimenor of 100 kN(11 ton)if pressing plates as described in 5.7 areused.5.7 Pressing Plates(Optional Apparatus),210 by 210 by 3mm,with a wooden handle.One of the plates should have a150-mm square area in the center of the plate milled out to adepth not to exceed 0.65 mm.5
12、.8 Scissors,small and sharp.5.9 Light SourceThe light source should be collimated toprovide a beam at grazing incidence to the prism.If anincandescent light source is used,it shall be of low intensity,such as a flashlight bulb.A sodium vapor lamp may also be1This test method is under the jurisdictio
13、n of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.11 on Chemical Analysis.Current edition approved Aug.1,2014.Published November 2014.Originallyapproved in 1995.Last previous edition approved in 2009 as D5775 95(2009)1.DOI:10.1520/D5775-95R14.2For referenced ASTM
14、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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 194
15、28-2959.United States1 used.The light source requirement is that a clear sharp linewith good contrast can be observed in the telescope of therefractometer.Attenuation or diffusion of the light for betterviewing may be accomplished by placing crumpled tissuepaper in the light path.6.Reagents6.1 Purit
16、y of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society,wheresuch specifications are available.3Other grades may be used,provided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.7.Reagents7.1 Acidified ETAAdd 10 cm3of concentrated hydrochlo
