ISO 2453:2020 PDF

Name: ISO 2453:2020 — Rubber, raw styrene-butadiene, emulsion-polymerized — Determination of bound styrene content — Refractive index method
SKU: ISO 2453:2020
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Rubber, raw styrene-butadiene, emulsion-polymerized — Determination of bound styrene content — Refractive index method

Название (английский):

ISO 2453:2020

Rubber, raw styrene-butadiene, emulsion-polymerized — Determination of bound styrene content — Refractive index method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 5 мая 2020 г.
Издание:: ISO IS 2453 edition 3 version 1
ICS:: 83.040.10

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Описание (английский):

This document specifies a method for determining the bound styrene content of emulsion-polymerized styrene-butadiene rubbers (SBR) by correlation with the measured refractive index of an extracted sample according to a table of refractive indices versus percentage mass fractions styrene. The method is also applicable to extracted oil-extended emulsion-polymerized SBR as long as it produces a film suitable for refractive index measurements. It is not applicable to solution-polymerized SBR.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview - ISO 2453:2020 (styrene‑butadiene rubber, SBR)

ISO 2453:2020 specifies a refractive‑index method for determining the bound styrene content of emulsion‑polymerized styrene‑butadiene rubber (SBR). The standard covers sample extraction, film preparation, refractometer measurement at 25 °C and the conversion of refractive index to percentage mass fraction of bound styrene. It applies to emulsion‑polymerized SBR and to extracted oil‑extended emulsion SBR that yield a film suitable for refractive‑index measurement. It is explicitly not applicable to solution‑polymerized SBR.

Key topics and requirements

Principle: correlate the measured refractive index of a thin, solvent‑extracted SBR film with bound styrene content using a tabulated refractive‑index vs. styrene percentage or the standard formula.

Sample preparation: cut and weigh representative pieces (following ISO 1795 sampling guidance), extract with an ethanol‑toluene azeotrope (ETA) - or acidified ETA for alum‑coagulated polymers - then dry to constant mass in a vacuum oven.

Film formation: press extracted rubber between aluminium foil at ~100 °C to form a homogeneous sheet not exceeding 0.50 mm thickness.

Measurement: use an Abbe‑type refractometer accurate to the fourth decimal place, maintained at 25 °C (±0.1 °C). Use α‑bromonaphthalene as contact liquid and take multiple readings (repeatability criteria specified).

Apparatus & reagents: wide‑mouthed conical flask, reflux condenser (or Soxhlet), vacuum oven, hydraulic press or pressing plates, aluminium foil, ETA and α‑bromonaphthalene.

Quality & precision: the standard describes required repeatability/acceptance criteria for readings and includes precision data in an informative annex.

Applications and users

ISO 2453:2020 is intended for:

Rubber manufacturers for process control (monitoring monomer charging and product uniformity).

Quality control laboratories performing routine bound styrene determination on emulsion‑polymerized SBR.

Contract testing and R&D labs characterizing SBR feedstock and verifying formulations (including oil‑extended types, when film formation is possible). Practical uses include incoming raw material inspection, batch consistency checks, troubleshooting polymerization, and correlating composition with physical properties.

Related standards

ISO 1795 - referenced for sampling and preparative procedures for raw rubber.

ISO 2453 includes an informative Annex A with evaluated precision data.

Keywords: ISO 2453:2020, styrene‑butadiene rubber, SBR, bound styrene content, refractive index method, ethanol‑toluene azeotrope, refractometer, emulsion‑polymerized SBR, rubber quality control.

ISO 2453:2020 PDF

Abstract

Похожие стандарты

Overview - ISO 2453:2020 (styrene‑butadiene rubber, SBR)

Key topics and requirements

Applications and users

Related standards

Технические детали

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