Cloud-point data to 170°C and 2800 bar (280 MPa) are presented for poly(ethylene-co-(31 mol%) methyl acrylate) at ~ 5 wt % in propane and in hexane and in mixtures of propane plus 5, 10, and 15 wt % hexane, hexene, methanol, ethanol, n-propanol and n-butanol. Hexane and hexene, which densify the propane, have no effect on the pressure-temperature location of the copolymer-propane cloud-point curve; however, the alcohols, which hydrogen bond to the acrylate repeat units, lower the curve by as much as 75°C. The magnitude of the temperature shift of the cloud-point curve decreases with increasing alcohol content as the acrylate units become saturated and the alcohol preferentially self-associates. Methanol is the least effective cosolvent as it self-associates more than the other alcohols at a given temperature
Посилання на статтю:
Comparison of the effect of density and hydrogen bonding on the cloud-point behaviour of poly(ethylene-co-methyl acrylate)-propane-cosolvent mixtures / Minna A. LoStracco, Sang-Ho Lee and Mark A. McHugh // Polymer. – 1994. – Vol 35. – P. 3272-3277.