Infrared thermography was employed to analyze multiple batches of the thermally latent polymerization of 3-ethyl-3-phenoxymethyloxetane at once. The temperature changes in the polymerization depended on the polymerization rates. That is, a fast polymerization was exothermic, increasing the temporal temperature of the polymerization by approximately 130 degrees C within a few minutes. Infrared thermography, which can analyze multiple samples instantaneously, proved effective as a screening method for thermally latent curing systems. Exothermicity in the cross-linking polymerization of 1,4-bis(3-ethyloxetanylmethoxy)benzene was also analyzed by infrared thermography. (c) 2006 Wiley Periodicals, Inc.