DiscussionThe present work presents, to our knowledge, the first directmeasurement of the glass transition temperature of TNT and itsvariation with cooling rate. However, it is important to recognizethat research on TNT in the late 1960s by May et al. [20] estimatedthe Tgof TNT to be −15.2◦C (258 K) based on nominal cooling at64 K/min (1.07 K/s). Clearly, from the data presented here, this esti-mate is too high by at least 15–20 K, but they did recognize that thematerial should vitrify when sufficiently supercooled to avoid crys-tallization. Importantly, they also reported that they saw evidencethat the cold crystallization after vitrification led to a different heatof fusion from that expected for a conventionally crystallized sam-ple, similar to the results reported above for the cooling rates at