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  • ISO
    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
    Edition: 2024
    $286.57
    / user per year

Content Description

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.



About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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