Sharif University of Technology Scientia Iranica 1026-3098 21 6 2014 12 01 A New Segmental Local Composition Model for Calculation Thermodynamic Properties of Binary Polymer Solutions A New Segmental Local Composition Model for Calculation Thermodynamic Properties of Binary Polymer Solutions 2087 2097 3602 EN Ali Haghtalab Department of Chemical Engineering, Tarbiat Modares University, P.O. Box: 14115-143, Tehran, Iran Abolfazl Shojaeian Department of Chemical Engineering, Tarbiat Modares University, P.O. Box: 14115-143, Tehran, Iran Elham Ebrahimiaqda Department of Chemical Engineering, Tarbiat Modares University, P.O. Box: 14115-143, Tehran, Iran Journal Article 2014 03 01 A new local composition model, Segmental-Wilson Non-Random Factor (S-Wilson-NRF), based on volume fraction is developed. The new activity coefficient model consists of combinatorial and residual terms that the combinatorial Flory-Huggins equation and the S-Wilson-NRF function are used for the entropy and enthalpy terms, respectively. This model for non-polymeric systems reduces to Nonelectrolyte-Wilson-NRF model. The present model with two dependent adjustable energy parameters is applied to correlation of the activity of solvent for 24 binary polymer systems at various number-average molar masses of polymer and temperatures. Moreover, the results of the present model are compared with the other local composition models such as Nonrandom Two-Liquid (NRTL), NRTL-Nonrandom Factor (NRTL-NRF) models and the Flory-Hugginsmodel. Finally, the new model is applied for correlation of the excess molar enthalpy of the binary polymer solutions at the different conditions. As a conclusion, the results of the new model are in good agreement with the experiment. https://scientiairanica.sharif.edu/article_3602_4cdb9722937a759b244b09635fe53188.pdf