ISO 21561-1:2015 PDF

Scope: This part of ISO 21561 specifies procedures for the quantitative determination of the microstructure of the butadiene and the content of styrene in solution-polymerized SBR (S-SBR) by 1H-NMR spectrometry as an absolute method and by IR spectrometry as a relative method. The styrene content is expressed in mass % relative to the whole polymer. The trans, cis and vinyl contents are expressed in mol % relative to the butadiene. These methods are applicable only for raw rubber. NOTE 1 IR spectrometry can also give absolute values of microstructure by calibration with S-SBRs of known absolute microstructure obtained by 1H-NMR spectrometry. 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; — cis: 1,4-cis unit, 1,4-cis bond, cis-1,4 unit or cis-1,4 bond. — trans: 1,4-trans unit, 1,4-trans bond, trans-1,4 unit or trans1,4 bond;

ISO 21561-1:2015 Referenced Document

ISO 1407:2011 Rubber - Determination of solvent extract
ISO 1795:2007 Rubber, raw natural and raw synthetic - Sampling and further preparative procedures
ISO/TR 9272:2005 Rubber and rubber products - Determination of precision for test method standards

2015 ISO 21561-1:2015 Styrene-butadiene rubber (SBR) - Determination of the microstructure of solution-polymerized SBR - Part 1: 1H-NMR and IR with cast-film method