Review on the Effect of Rheological Properties of the Polymers on Preparation of Hollow Fiber Membranes

In this paper, rheological properties of polymeric solutions are investigated in hollow fiber membranes fabrication, when the solutions are close to newtonian or pseudo plastic fluids. Studies in this field show that for pseudo plastic dope solutions, according to process and solution conditions, shear rate increasing results in obtaining dense membranes with narrow and limited pore size distribution, and so low permeate flux and high rejection percent which shows high selectivities. However, when dope solution follows newtonian behavior, prepared membrane are porous with widespread pore size distribution which have high permeate flux and low rejection percent.