The glass transition temperature (T-g) of acrylated triglycerides was clearly a function of the level of acrylation of triglyceride-based polymers and was modeled using simple empirical relationships. We began by calculating the distribution of unsaturation sites in plant oils. We assumed a binomial distribution of chemical functionality that was added to these unsaturation sites to calculate the distribution of epoxides, acrylates, and reacted acrylates to predict the crosslink density, thermal softening, and dynamic mechanical behavior. The glass transition temperatures of n-acrylated triglycerides were used as the relaxation temperatures of acrylated oils with a broad distribution of functionality for prediction of the modulus as a function of temperature. Essentially, the percent drop in the elastic modulus is equal to the percentage of n-acrylated triglycerides in the acrylated oil with T-g less than that of the ambient temperature. The tan (delta) was also accurately predicted based on the percentage change of n-functional triglycerides as the temperature changes from one relaxation temperature to the next. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 127: 1812-1826, 2013