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ISO 21561-2:2024

Styrene-butadiene rubber (SBR) - Determination of the microstructure of solution-polymerized SBR - Part 2: Fourier transform infrared spectrometry (FTIR) with attenuated total reflection (ATR) method
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ISO 21561-2:2024

Styrene-butadiene rubber (SBR) - Determination of the microstructure of solution-polymerized SBR - Part 2: Fourier transform infrared spectrometry (FTIR) with attenuated total reflection (ATR) method

PUBLISH DATE 2024
ISO 21561-2:2024

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.
SDO ISO: International Organization for Standardization
Document Number ISO 21561
Publication Date Jan. 1, 2024
Language en - English
Page Count 20
Revision Level
Supercedes
Committee ISO/TC 45/SC 3
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