Prediction of morphology of the membranes by comparing thermodynamic and kinetic properties of membrane
Paper ID : 1304-MST2015-FULL
Authors:
1sajjad mohsenpour *, 2Maryam Tavakolmoghadam, 3Aliakbar Safekordi, 4Mahmood Hemmati, 5Fatemeh Rekabdar
1sharif university
2Research Institute of Petroleum Industry and Iran university of science and technology
3Department of Chemical and Petroleum Engineering, Sharif University of Technology
4Chemical Polymeric and Petrochemical Technology Development Research Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran
5Research institute of petroleum industry
Abstract:
The morphology of asymmetric and symmetric membranes obtained by precipitation can be rationalized by thermodynamic and kinetic relations of phase separation. In this study, two main parameters including demixing process and precipitation rate which affect the morphology of the membranes were determined for the system of PVDF/TiO2/DMAc/Water. Such parameters which the former relates to thermodynamic effect and the latter controls the time of separation of the cast solution film immersing in the non-solvent bath from the glass plate were calculated as dimensionless parameters for further analysis. Quadratic phase diagram was drawn based on Flory Huggins theory. The prepared membranes were characterized by measuring permeability, porosity and contact angel of membranes. The effect of two mentioned dimensional parameters on the membrane morphology was studied by comparing the calculated parameters with each other and with experimental results.
Keywords:
morphology-phase diagram-thermodynamic and kinetic properties
Status : Paper Accepted (Poster Presentation)