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ISO 21400:2018

Pulp -- Determination of cellulose nanocrystal sulfur and sulfate half-ester content

General information
Valid from 18.12.2018
ICS Groups
85.040 Pulps
Directives or regulations
None
Standard history
Status
Date
Type
Name
18.12.2018
Main
This document specifies procedures for the laboratory determination of the total elemental sulfur and the sulfate half-ester content of cellulose nanocrystals (CNCs) by inductively coupled plasma-optical emission spectroscopy and conductometric titration, respectively, including sample preparation, measurement methods and data analysis. This document is applicable to the characterization of CNCs: a) with all monovalent counterions (particularly hydronium and sodium cations); b) which are either in the never-dried state in aqueous suspension, or have been redispersed from a dried form; and c) which have been extracted from any naturally occurring cellulose source using a range of sulfuric acid hydrolysis conditions, or have been sulfated post-hydrolysis using sulfuric acid.
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