Abstract
The high temperature demixing of solutions of poly(decyl methacrylate) (PDMA) was measured as a function of pressure for the following solvents: n-pentane, cyclo-pentane, n-hexane, n-heptane, iso-octane and toluene. In all cases the application of pressure increases the miscibility in the order of 0.4–1.0 K/bar. The lower critical solution temperatures extrapolated to atmospheric conditions range from 155 (n-pentane) to 261°C (toluene); no phase separation could be observed with the base oil AF I of Schindler up to 370°C. Noticeable thermal degradation of the polymer sets in when the solutions are heated above ca. 300°C.
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