Styrene-butadiene rubber (SBR) — Determination of the microstructure of solution-polymerized SBR — Part 2: FTIR with ATR method ((ISO 21561-2:2016))
This part of ISO 21561 specifies procedures for the quantitative determination of the microstructureof the butadiene and the content of styrene in solution-polymerized SBR (S-SBR) by Fourier TransformInfrared Spectrometry (FTIR) with Attenuated Total Reflection (ATR) method. The styrene content isexpressed in mass % relative to the whole polymer. The vinyl, trans and cis contents are expressed inmol % relative to the butadiene content. This method is only applicable to raw rubbers.NOTE 1 Precision as shown in Annex A may not be obtained for S-SBRs containing polystyrene block orstyrene content more than 45 mass %.NOTE 2 Only “vinyl”, “trans” and “cis”, are used in this part of ISO 21561. However, the expression of vinyl,trans and cis mean as follows in general:— vinyl: vinyl unit, vinyl bond, 1,2-unit, 1,2-bond, 1,2-vinyl-unit or 1,2-vinyl-bond;— trans: 1,4-trans unit, 1,4-trans bond, trans-1,4 unit or trans1,4 bond;— cis: 1,4-cis unit, 1,4-cis bond, cis-1,4 unit or cis-1,4 bond.