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为适应生产和科研需要,我们采用玻璃沸点仪,选择不同溶剂和不同试样,测定了不同类型的已知分子量的表面活性剂,取得较好的效果。其原理是基于溶剂中加入溶质后,溶剂的沸点将升高,升高的程度与所加溶质浓度有关,从而导出沸点升高值与溶质分子量之间关系。测定范围100~4000,误差小于3%,一般在 1%左右。一、设备装置1．沸点仪:示意图见图1。2．电加热器:将直径为0．20~0．25毫米、长为2米的镍铬丝绕在直径5毫米、长
In order to meet the production and scientific research needs, we use glass boiling point instrument, choose different solvents and different samples, measured different types of surfactants of known molecular weight, and achieved good results. The principle is based on the solute added to the solvent, the boiling point of the solvent will increase, the degree of increase and the concentration of solute added, leading to the relationship between the increase in boiling point and solute molecular weight. Determination of 100 ~ 4000, the error is less than 3%, usually about 1%. First, equipment installation 1. Boiling point meter: Schematic diagram shown in Figure 1.2. Electric heater: a diameter of 0.20 ~ 0.25 mm, length of 2 meters of nickel-chromium wire wound on the diameter of 5 mm, long