ISO 6796-1981 工业用聚乙二醇 羟值的测定 邻苯二甲酸酐酯化法

标准号：ISO 6796-1981
中文标准名称：工业用聚乙二醇 羟值的测定 邻苯二甲酸酐酯化法
英文标准名称：Polyglycols for industrial use; Determination of hydroxyl number; Phthalic anhydride esterification method
标准类型：G15
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G15
国际标准分类号：71.080.60
适用范围：The hydroxy groups present in a test portion are esterified with phthalic anhydride. The excess phthalic anhydrids is hydrolyzed and the phthalic acid formed is neutralized with standard volumetric sodium hydroxide solution. If the sample contains free acidity or alkalinity a corresponding correction is made. From the corrected hydroxyl number, the apparat relative molecular mass may be calculated by a formula given.