苯乙烯 丁二烯橡胶（SBR）—溶液聚合SBR微观结构的测定— 第2部分：衰减全反射（ATR）法傅里叶变换红外光谱（FTIR）

[中文适用范围]： 本文件规定了用衰减全反射（ATR）法傅里叶变换红外光谱（FTIR）定量测定溶液聚合丁苯橡胶（S-SBR）中丁二烯部分微观结构和苯乙烯含量的程序。苯乙烯含量以相对于 S-SBR 的质量分数表示。乙烯基、反式和顺式三种微观结构类型的含量以相对于 S-SBR 中丁二烯部分的摩尔分数表示。该方法仅适用于生胶。注 1 对于含聚苯乙烯嵌段或苯乙烯含量超过 45% 的 S-SBR，并不总能获得附录 A 所示的精度。注 2 本文件中仅使用“乙烯基”、“反式”和“顺式”。但乙烯基、反式和顺式的表达一般含义如下： — 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。 [外文原描述]： This document specifies procedures for the quantitative determination of the microstructure of the butadiene portion 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 fraction relative to the S-SBR. The contents of three microstructure types, i.e. vinyl, trans and cis, are expressed in mol fraction relative to the butadiene portion in the S-SBR. This method is only applicable to raw rubbers. NOTE 1 Precision as shown in Annex A is not always possible to obtain for S-SBRs containing polystyrene block or styrene content more than 45 %. NOTE 2 Only “vinyl”, “trans” and “cis”, are used in this document. 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.