1.1 碳-13核磁共振波谱 ( 13 C NMR）测量用于制备柔性聚氨酯泡沫的环氧乙烷（EO）-环氧丙烷（PO）聚醚多元醇的伯羟基含量。该方法最适合伯羟基含量为10至90的聚醚多元醇 %. 1.2 以国际单位制表示的数值应视为标准。 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）。本标准的使用者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。 注1: 目前还没有与该标准等效的ISO。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 伯羟基含量提供了关于多元醇在与异氰酸酯的氨基甲酸酯形成反应中的相对反应性的信息。

1.1 Carbon-13 Nuclear Magnetic Resonance Spectroscopy ( 13 C NMR) measures the primary hydroxyl content of ethylene oxide (EO)-propylene oxide (PO) polyether polyols used in preparing flexible polyurethane foams. This method is best suited for polyether polyols with primary hydroxyl contents of 10 to 90 %. 1.2 The values stated in SI units are to be regarded as standard. 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. Note 1: There is no known ISO equivalent to this standard. 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 ====== 5.1 The primary hydroxyl content provides information about the relative reactivities of polyols in the urethane forming reaction with isocyanates.