ISO 6235:2016 PDF
Rubber, raw — Determination of block polystyrene content — Ozonolysis method
Rubber, raw — Determination of block polystyrene content — Ozonolysis method
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 5
- Дата публикации:
- 14 сентября 2016 г.
- Издание:
- ISO IS 6235 edition 3 version 1
- ICS:
- 83.040.10
ISO 6235:2016 specifies a method for the determination of the long polystyrene block content of raw uncompounded styrene-butadiene rubber (SBR) and raw uncompounded blends of block SBR. It is not applicable to blends of block SBR with EPDM, IIR, CSM and other halogenated rubbers. The method is applicable to raw, uncompounded latices of the above compositions and is suitable for rubbers having block polystyrene contents in the range from 5 % (by weight) to 100 % (by weight). Rubbers having block polystyrene contents of less than 5 % (by weight) may yield incorrect results unless a correction factor, based on information gained by working with such rubbers, is applied. The method is intended for use on gel-free rubbers, but it may be used on rubbers containing gel if it has been proved that the gel does not interfere.
Abstract
Overview
ISO 6235:2016 - "Rubber, raw - Determination of block polystyrene content - Ozonolysis method" specifies an analytical procedure for measuring the long block polystyrene fraction in raw, uncompounded styrene‑butadiene rubber (SBR) and blends of block SBR. The method is applicable to raw solids and latices and covers block polystyrene contents from 5 % to 100 % (by mass). It is intended for gel‑free rubbers (or rubbers with gel only if it is shown not to interfere). ISO 6235:2016 is not applicable to blends of block SBR with EPDM, IIR, CSM or other halogenated rubbers.
Key Topics and Requirements
- Principle: Dissolve sample in dichloromethane, cleave ethylenic linkages by ozone (ozonolysis), decompose ozonides with sulfuric acid in methanol, and separate high‑molecular‑weight block polystyrene (insoluble) from soluble fragments.
- Scope limits: Reliable for 5–100 % block polystyrene; results for
Технические детали
- Технический комитет
- ISO/TC 45/SC 3 - Raw materials (including latex) for use in the rubber industry
- SKU
- ISO 6235:2016
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