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 kineticrnparameters for thermally unstable materials using differential scanning calorimetry (DSC).rnE2041 employs the single scan Borchardt and Daniels approach while E698 uses thernOzawa/Flynn/Wall multiple heating rate method. These approaches are applicable to nth orderrnreactions. E2041 determines the kinetic parameters of activation energy, pre-exponential factorrnand reaction order while E698 assumes first order. Two interlaboratory tests were conductedrnusing trityl azide to evaluate the precision of these two methods. The within laboratoryrnactivation energy relative standard deviation of the two methods is approximately equal at 3.0 %rnHowever, E698 shows a between laboratory reproducibility relative standard deviation of 6.5 %,rnmore than a factor of 2 better than the value of 14 % for E2041.