标准摘要
[中文适用范围]： 通过该方法测定的游离酸度包括可被水提取的酸度和由于直接连接至醋酸纤维素的酸性基团例如羧基而产生的酸度。 本方法不适用于含有任何可能影响测试的添加剂的醋酸纤维素。 其原理在于用水处理醋酸纤维素的测试部分并用氢氧化钠溶液滴定所得溶液。 游离酸度计算为醋酸纤维素中游离乙酸的质量百分比。 第二版取消并取代了第一版 ISO 1061:1975，并对第一版进行了较小的技术修订。 [外文原描述]： The free acidity determined by this method includes acidity extractable by water and acidity due to acidic groups directly attached to the cellulose acetate, e.g. carboxyl groups. This method is not suitable for cellulose acetate containing any additives which may affect the test. The principle consists in treating a test portion of cellulose acetate with water and titrating the resultant solution with sodium hydroxide solution. The free acidity is calculated as the percentage, by mass, of free acetic acid in the cellulose acetate. This second edition cancels and replaces the first edition ISO 1061:1975, of which it constitutes a minor technical revision.
英文名称Plastics — Unplasticized cellulose acetate — Determination of free acidity