1,1,1,3,3,3-Hexafluoroisopropyl Methacrylate (stabilized with MEHQ)

Hexafluoroisopropyl methacrylate (HFIP-M) is a colorless and transparent liquid, and its acidity has an important influence on its quality. The method for determining the acidity of hexafluoroisopropyl methacrylate has been explored through experiments, and three methods are used Commonly used methods to determine acidity: 1) Use potentiometric method to indicate the end point of the titration, and use an automatic potentiometer in the titration; 2) Use an indicator to visually check the end point of the titration; 3) First extract the acid in the sample with water or saturated sodium chloride aqueous solution Enter the water phase, and then measure the acidity in the aqueous solution by alkali titration. Compared with the above three methods, the results show that: Method 1 has a sharp titration curve, and it avoids the error of the end point judgment of the manual titration; Use Method 2 to test Among the three indicators, methyl red has a more obvious color change at the end of the titration, and the results are consistent with the results determined by the potentiometric titration method; the test of method 3 shows that the use of saturated sodium chloride solution as the extractant can significantly improve the separation Effective, but the measurement result after separation is low, and the operation process of this method is long and cumbersome.