ISO 21561-2:2024

No disponible en español

Publicado (Edición 2, 2024)

ISO 21561-2:2024

CHF 96

Convertir Franco suizo (CHF) a tu moneda

Resumen

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.

Informaciones generales

Estado
: Publicado

Fecha de publicación
: 2024-08

Etapa
: Norma Internacional publicada [60.60]
Edición
: 2

Número de páginas
: 15
Comité Técnico :
ISO/TC 45/SC 3

ICS :
83.060
RSS actualizaciones