Interlaboratory Kinetic Studies Using ASTM International Standards E2041 and E698 and Trityl Azide

摘要

ASTM International standards E2041 and E698 are commonly used to determine kinetic parameters for thermally unstable materials using differential scanning calorimetry (DSC). E2041 employs the single scan Borchardt and Daniels approach while E698 uses the Ozawa/Flynn/Wall multiple heating rate method. These approaches are applicable to nth order reactions. E2041 determines the kinetic parameters of activation energy, pre-exponential factor and reaction order while E698 assumes first order. Two interlaboratory tests were conducted using trityl azide to evaluate the precision of these two methods. The within laboratory activation energy relative standard deviation of the two methods is approximately equal at 3.0 % However, E698 shows a between laboratory reproducibility relative standard deviation of 6.5 %, more than a factor of 2 better than the value of 14 % for E2041.