| 초록 |
The poly(methyl methacrylate-co-n-pentyl acrylate) [P(MMA-co-PA)] was prepared using supercritical dispersion polymerization in supercritical carbon dioxide. Experimental cloud-point up to 434K and 206 MPa are reported for binary and ternary mixtures of P(MMA-co-PA) in supercritical CH2F2, CHF3 and CHClF2. Phase behavior of binary system for the P(MMA-co-PA) (25:1, AIBN: 1.0, 2.0 and 4.0 wt%) + CH2F2, CHF3 and CHClF2 mixtures at temperature range from 332 K to 434 K and pressure up to 160 MPa are measured the upper critical solution temperature (UCST) type behavior with negative slope for the P(MMA-co-PA) + CH2F2, and lower critical solution temperature (LCST) type curve with positive slope for the P(MMA-co-PA) + CHF3 and P(MMA-co-PA) + CHClF2 mixtures. The P(MMA-co-PA) + CH2F2 + MMA (or CHClF2) systems were measured in change of the pressure-temperature slope and with MMA (or CHClF2) mass fraction. The phase behavior data on the P(MMA-co-PA) + CH2F2 + MMA(or CHClF2) systems show that the pressure-temperature curve changes from UCST region to LCST region as the MMA (or CHClF2) mass fraction grows. |
