韦氏法测定端羟基聚丁二烯碘值的探究

Exploration on determining iodine value of hydroxyl-terminated polybutadiene by Wijs method

采用韦氏法研究了端羟基聚丁二烯(HTPB)样品的碘值测定,对其实验条件,如称样量、反应时间、液封等进行了探究。结果表明,在HTPB样品碘值的测定过程中,要用碘化钾溶液密封反应瓶口,最优称样量为0.3g,反应时间为100min。该法具有较高的精密度,且存放30d后样品的检测结果重现性的相对标准偏差为1.32%。

The iodine value determination of the hydroxyl-terminated polybutadiene(HTPB)sample was investigated by using the Wijs method, and the experimental conditions such as sampling quantity, reaction time, liquid seal and so on were explored. The results show that during the iodine value determination of HTPB sample, the reaction bottle mouth should be sealed with potassium iodide solution,the optimal sampling quantity is 0.3 g, the reaction time is 100 min. Said method possesses higher precision,and the relative standard deviation of the reproducibility of the sample testing results after storing for 30 d is 1.32%.