| 초록 |
Polyethylene (PE) membranes containing controlled pore sizes and porosities were fabricated using a polytetramethylene glycol (PTMG) mixture with paraffin as a novel diluent via a thermally-induced phase separation (TIPS) process. PTMG could not be used as a diluent alone regardless of its molecular weight because it does not form a single phase mixture with PE over the entire temperature range. However, PTMG and paraffin mixtures, which exhibited upper critical solution temperature (UCST) type phase behavior, formed miscible blends with PE at elevated temperatures. The phase separation temperature of the PE//(paraffin/PTMG) ternary mixture increased with increasing PTMG content in the diluent mixture when PE content was fixed. At a fixed blend composition, the phase separation temperature of the PTMG/paraffin mixture increased as the molecular weight of the PTMG decreased, while that of the PE//(paraffin/PTMG) ternary mixture increased with increasing PTMG molecular weight. |
