The effect of molecular weight on the crystallinity and crystallization rate of polycarbonate (PC) in the presence of supercritical CO2 was studied at temperatures from 75 to 175 degrees C and at pressures up to 20 MPa. Crystallinities decreased ca. 0.05 and maximum crystallization rates decreased ca. 50% with an increase in the weight-average molecular weights of the PC from 19.2 to 29.8 kg/mol. Moreover, the maximum crystallization rates were properly correlated with the average absolute error of 30% by considering the changes in the glass transition temperature and melting temperature caused by the plasticization effect of dissolved CO2. (C) 2016 Elsevier B.V. All rights reserved.