1.1 本试验方法适用于通过Zeisel气相色谱技术测定纤维素醚产品中的甲氧基和羟丙基取代含量。 1.2 由于羟丙基纤维素的取代度很高，因此本试验方法不适用于羟丙基纤维素的分析。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体的危险说明，请参阅第节 2. , 11.1.4 和 11.1.7 . 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 3.1 本试验方法通过Zeisel气相色谱技术测定纤维素醚的甲氧基和羟丙氧基含量。 3.2 取代度影响聚合物的溶液性质、流变性、粘度和许多其他性质。

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 for the analysis of hydroxypropyl-cellulose due to its very high substitution level. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 2 , 11.1.4 , and 11.1.7 . 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 3.1 This test method determines the methoxyl and hydroxypropoxyl 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.