Formation of porous polymer membrane by the phase separation method using supercritical carbon dioxide
Date Issued
2006
Date
2006
Author(s)
Huang, Ru-Ping
DOI
zh-TW
Abstract
Porous polymer membranes of cellulose triacetate and polyetherimide have been prepared using a supercritical fluid phase inversion process. 1,4-Dioxane and carbon dioxide were used as the solvent and non-solvent respectively. The dry membranes were directly obtained without post-treatment after the pressure was diminished. Series of experiments were performed at various pressures, temperatures and polymer concentrations. Their effects on the average pore size, pore size distribution and porosity of membranes were investigated.
It is concluded that high pressure and lower temperature favor the formation of high porosity and smaller pore size of porous polymer membranes. At the optimal operation temperature (T=35℃), pressure (P=40 MPa) and initial polymer solution concentration (10 wt%), the minimum pore size and maximum porosity were observed as 0.29μm and 88%, respectively.
Moreover, we also observed membrane structures via changing polymer solution concentration for poyetherimide/1,4-dioxane/SC-CO2 system in this study. Concentration influences the change in membrane structures from cellular structure to nodules structure.
Subjects
多孔性薄膜
超臨界二氧化碳
相分離法
三醋酸纖維素
聚醚醯亞胺
porous membrane
supercritical carbon dioxide
phase inversion
cellulose triacetate
polyetherimide
Type
thesis
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