T p (temperature of peak decomposition, i.e., temperature at which the rate of polymer decomposition is maximum), T d (onset decomposition temperature, i.e., temperature at which about 5% of polymer mass is lost), and (T p + T d )/2. To predict relative polymer degradation using the small molecule trained models, linear dimers, trimers, and tetramers were employed as small molecule surrogates. Results for the trimer are presented in the following sections, with complete results for the dimer and tetramer available in the Supplementary Information (SI). The polymer dataset was divided into six categories (Fig. ) for a detailed analysis to check for the emergence of any patterns: i) all, ii) chain growth, iii) step growth, iv) CH (hydrocarbon-only polymers), v)