NDLI: Phase separation in polystyrene-poly(vinyl methyl ether) blends dilated with compressed carbon dioxide

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Phase separation in polystyrene-poly(vinyl methyl ether) blends dilated with compressed carbon dioxide

Content Provider	Semantic Scholar
Author	Ramachandrarao, Vijayakumar S. Watkins, James Joseph
Copyright Year	2000
Abstract	The phase behavior of polystyrene (PS)/poly(vinyl methyl ether) (PVME) blends of various compositions in the presence of compressed carbon dioxide was investigated using in-situ high-pressure fluorescence spectroscopy. Sorption of a few weight percent of CO2, which is a poor solvent for both components but selective for PVME, induces phase separation at 40 and 60 °C for all compositions studied. These transitions occur as much as 90 °C below the coexistence temperatures for the corresponding binary blends at ambient pressure. The Sanchez−Lacombe equation of state qualitatively predicts phase separation in the PS/PVME/CO2 system as CO2 pressure is increased isothermally. A semiquantitative stability analysis suggests that a disparity in the free volumes of the polymer components upon dilation with carbon dioxide, rather than enthalpic contributions, is the principal driver for phase separation in this system.
Starting Page	5143
Ending Page	5152
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1021/ma000066e
Volume Number	33
Alternate Webpage(s)	https://www.pse.umass.edu/sites/default/files/watkins/Watkins-Macromolecules-2000-5143.pdf
Alternate Webpage(s)	http://www.pse.umass.edu/sites/default/files/watkins/Watkins-Macromolecules-2000-5143.pdf
Alternate Webpage(s)	https://doi.org/10.1021/ma000066e
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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