Prediction of volumetric properties of polymer melts using new perturbed hard-chain equation of state

A perturbed hard-sphere equation of state (PHS EOS) has been previously employed for modeling the volumetric properties of some molten metals and ionic liquids (S.M. Hosseini, M.M. Papari, F. Fadaei-Nobandegani, J. Moghadasi, J. Non-Cryst. Solids 358 (2012) 1753–1758). In this work, the chained version of our previous PHS EOS has been developed for predicting the volumetric properties of 19 polymer melts including homopolymers and copolymers. The performance of the proposed EOS has been checked by comparing the results with 2273 literature data points for the specific volumes over wide temperature and pressure range, the overall average absolute relative deviation (AARD) was found to be 0.33%. Uncertainty of specific volume calculations was of the order of ±2.0%. Isothermal compressibility coefficient (κT), of studied polymer melts has also been estimated and compared with those obtained by the use of Tait equation; from 1349 data points examined, the AARD was found to be 3.91%.