Designation:D5775−95(Reapproved2019)StandardTestMethodforRubber—DeterminationofBoundStyreneinStyreneButadieneRubberbyRefractiveIndex1ThisstandardisissuedunderthefixeddesignationD5775;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofstyrenecontent,andisintendedforgeneraluseonsoliduncom-poundedstyrene-butadienecopolymers,commonlyreferredtoasSBR,preparedbytheemulsionprocess.SBRpolymerspreparedinsolutionwillrequiretheuseofdifferentrefractiveindextablesbecausethevinylcontentofthebutadienediffersfromthatintheemulsionpolymers.Itisapplicabletopolymershavinglessthan55%boundstyrene.NOTE1—ThenomenclatureusedinthistestmethodisinaccordancewithPracticeD1418.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1418PracticeforRubberandRubberLatices—NomenclatureD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries3.SummaryofTestMethod3.1AsampleofdriedETA-extractedpolymerispressedbetweensheetsofaluminumfoiltoprovidesheetedrubberhavingathicknessofnotmorethan0.50mm.Theboundstyrenecontentiscalculatedfromtherefractiveindexobtainedat25°Conthisthinlysheetedrubber.4.SignificanceandUse4.1Theboundstyrenetestisameasureoftheboundmonomericcompositionoftherubber.Itisu...
