Aktivní norma | Vydána: 18.12.2018

ISO 21400:2018

Pulp — Determination of cellulose nanocrystal sulfur and sulfate half-ester content
(Pâte — Détermination de la teneur en soufre et en demi-ester de sulfate des nanocristaux de cellulose)

Dostupné jazyky: Anglicky

Dostupné provedení: Elektronické PDF, Tištěné

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Podrobné informace

Označení: ISO 21400:2018

Datum vydání: 18.12.2018

Stran: 26

Země: Mezinárodní technická norma

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Anotace

Description / Abstract: 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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