BS ISO 21561-2:2016规定了显微结构定量测定的程序 傅里叶变换法测定溶聚丁苯橡胶（S-SBR）中丁二烯和苯乙烯含量 衰减全反射红外光谱法。苯乙烯含量为 以相对于整个聚合物的质量百分比表示。乙烯基、反式和顺式含量以 相对于丁二烯含量的摩尔百分比。此方法仅适用于生橡胶。注1:对于含有聚苯乙烯块或苯乙烯含量超过45质量%的S-SBR，可能无法获得附录A所示的精度。注2:ISO 21561本部分仅使用“乙烯基”、“反式”和“顺式”。然而，乙烯基、反式和顺式的表达通常如下所示: 乙烯基:乙烯基单元、乙烯基键、1,2-单元、1,2-键、1,2-乙烯基单元或1,2-乙烯基键；反式:1,4-反式单元、1,4-反式键、反式1,4单元或反式1,4键；顺式:1,4-顺式单元、1,4-顺式键、顺式1,4单元或顺式1,4键。交叉引用:ISO 1795ISO 21561-1:2015ISO/TR 9272:2005购买时可用的所有当前修订版均包含在本文件的购买中。

BS ISO 21561-2:2016 specifies procedures for the quantitative determination of the microstructure of the butadiene and the content of styrene in solution-polymerized SBR (S-SBR) by Fourier Transform Infrared Spectrometry (FTIR) with Attenuated Total Reflection (ATR) method. The styrene content is expressed in mass % relative to the whole polymer. The vinyl, trans and cis contents are expressed in mol % 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 or styrene 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.Cross References:ISO 1795ISO 21561-1:2015ISO/TR 9272:2005All current amendments available at time of purchase are included with the purchase of this document.