Author/Authors :
Elham Shokri Chemical Engineering, Sahand University of Technology, Tabriz, Iran , Reza Yegani Chemical Engineering, Sahand University of Technology, Tabriz, Iran , Zahra Godarzi Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran , Leila Noori Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran , Maryam Alikhani Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran
كليدواژه :
Microporous membrane , Thermally induced phase separation , Linear low density polyethylene , Cooling bath effect
چكيده لاتين :
Thermally induced phase separation (TIPS) is versatile method for making
microporous membranes. The purpose of this work is to investigate the cooling
bath temperature and type effects on the membrane structure prepared via TIPS
method. The morphology of the resulting membrane shows a typical bicontinuous
structure. When quenching into water at different temperatures, a larger pore size
was obtained at higher temperature. Pore sizes are about 0.7 μm, 1.2 μm, and 2.2
μm for the water cooling bath with 273K, 303K and 333K. Porosity and tensile
tests confirm these results. When the composition of the coagulation bath is similar
with the diluents, the chemical potential difference of diluents would be declined
and the concentration of diluent in polymer lean phase would be kept constant in
stagnant condition which leads the droplets to grow and the pore size of the system
will be larger. However in water cooling bath, the concentration of diluent in
polymer lean phase decreased rapidly and pore size growth is decelerated which
result is lower porosity
