BS ISO 21561-1:2015规定了混凝土微观结构的定量测定程序 1H-NMR法测定溶聚丁苯橡胶（S-SBR）中丁二烯和苯乙烯的含量 作为绝对方法，红外光谱法作为相对方法。苯乙烯含量表示为: 相对于整个聚合物的质量百分比。反式、顺式和乙烯基含量以相对摩尔百分比表示 去丁二烯。这些方法仅适用于生橡胶。注1:红外光谱法还可以通过使用已知的S-SBRs进行校准，给出微观结构的绝对值 通过1H-NMR光谱获得的绝对微观结构。注2:ISO 21561本部分仅使用“乙烯基”、“反式”和“顺式”。然而，乙烯基的表达， 反式和顺式的意思一般如下: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 1407ISO 1795ISO/TR 9272取代BS ISO 21561:2005+A1:2010，该标准仍然有效。购买本文件时，所有当前可用的修订版均包含在购买本文件中。

BS ISO 21561-1:2015 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;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 1407ISO 1795ISO/TR 9272Replaces BS ISO 21561:2005+A1:2010 which remains currentAll current amendments available at time of purchase are included with the purchase of this document.