Determination of hydrochloric acid content in PMIA resin solution
Using sodium acetate-methanol solution and potassium hydroxide-methanol solution as titrants,the hydrochloric acid content in poly(m-phenylene isophthalamide)(PMIA)resin solution with different degrees of neutralization was determined by potentiometric titration.The accuracy and precision of the two test methods were compared.The results showed that the two test methods provided the similar test results when used to determine the hydrochloric acid content in PMIA resin solutions with neu-tralization degrees of 0,60%,95%,and 100%,respectively;two statistical methods,F-test and t-test,were used to verify that there was no profound significant difference in accuracy and precision between the two test methods and the test method using po-tassium hydroxide-methanol solution as a titrant had higher precision when the significance level was 0.05 and the confidence lev-el was 95%;the average recovery rate was 96.5%-98.5%,verifying the accuracy of this method,when the hydrochloric acid re-covery rate of PMIA resin solutions with different degrees of neutralization was determined by standard hydrochloric acid addition method using potassium hydroxide-methanol solution as a titrant;and the acidity and alkalinity of PMIA resin solution,whose e-quivalent point was difficult to be identified during the normal titration process,can be determined by pre-adding a known amount of hydrochloric acid and then titrating with potassium hydroxide-methanol solution.
poly(m-phenylene isophthalamide)solutiondegree of neutralizationhydrochloric acid contentpotentiometric titration
万方数据
维普
