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

摘要

A perturbed hard-sphere equation of state (PHS EOS) has been previously employed for modeling thevolumetric 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 versionof our previous PHS EOS has been developed for predicting the volumetric properties of 19 polymer meltsincluding homopolymers and copolymers. The performance of the proposed EOS has been checked bycomparing the results with 2273 literature data points for the specific volumes over wide temperature andpressure range, the overall average absolute relative deviation (AARD) was found to be 0.33%. Uncertaintyof specific volume calculations was of the order of ±2.0%. Isothermal compressibility coefficient (κT), ofstudied polymer melts has also been estimated and compared with those obtained by the use of Taitequation; from 1349 data points examined, the AARD was found to be 3.91%.