We use the PC-SAFT equation of state to model the solubility of CO2 in various homopolymers. We also model the swelling ratio of the PP (polypropylene)-CO2 mixture using PC-SAFT and then compare the results with Sanchez-Lacombe (S-L) and Simha-Somcynsky (S-S) equations. The results show that PC-SAFT can describe the solubility of CO2 in polymers very well. We compare two sets of parameters in the PC-SAFT equation, Gross et al.' s and Chen et al.'s. As for the swelling ratio, PC-SAFT using Chen et al. parameters is better than S-L equation, which is commonly used by early researchers in studying the solubility of CO2 in polymers. (C) 2017 Wiley Periodicals, Inc.