ISO-21400 Pulp - Determination of cellulose nanocrystal sulfur and sulfate half-ester content

ISO-21400 - 1ST EDITION - CURRENT


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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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Document Number

ISO 21400:2018

Revision Level

1ST EDITION

Status

Current

Publication Date

Dec. 1, 2018

Committee Number

ISO/TC 6