Astm D 3876 – 96 (Reapproved 2001) pdf free download

Standard Test Method for
Methoxyl and Hydroxypropyl Substitution in Cellulose Ether
Products by Gas Chromatography1

This standard is issued under the fixed designation D 3876; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This test method is applicable to the determination of
methoxyl and hydroxypropyl substitution content in cellulose
ether products by a Zeisel-gas chromatographic technique.

1.2 This test method is not suitable for use in the analysis
of hydroxypropyl-cellulose due to its very high substitution

1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard
statements, see Section2,11.1.4, and 11.1.7.

2. Summary of Test Method

2.1 When methylcellulose or hydroxypropyl methylcellulose is reacted with hydriodic acid, 1 mol of methyl iodide and
1 mol of isopropyl iodide is liberated for each mole of
methoxyl and hydroxypropyl that are substituted on the
cellulose chain. The methyl iodide and isopropyl iodide are
extracted in situ with o-xylene and quantitated by gas chromatography using an internal standard technique.

3. Significance and Use

3.1 This test method determines the methoxyl and hydroxypropyl content of cellulose ethers by a Zeisel-gas chromatographic technique.

3.2 Substitution levels affect solution properties, rheology,
viscosity, and many other properties of the polymer.

4. Apparatus

4.1 Gas Chromatograph,2 with thermal conductivity detector and a heated injection port.

4.2 Electronic Integrator3

4.3 Stainless Steel Tubing,4 9.5 mm in outside diameter and

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