Solubility of Homopolymers and Copolymers in Carbon Dioxide
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- 作者：M. L. O'Neill ; Q. Cao ; M. Fang ; K. P. Johnston ; S. P. Wilkinson ; C. D. Smith ; J. L. Kerschner ; and S. H. Jureller
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：1998
- 出版时间：August 1998
- 年：1998
- 卷：37
- 期：8
- 页码：3067 - 3079
- 全文大小：145K
- 年卷期：v.37,no.8(August 1998)
- ISSN：1520-5045
文摘
The cloud points of various amorphous polyether, polyacrylate, and polysiloxane homopolymers,and a variety of commercially available block copolymers, were measured in CO2 at temperaturesfrom 25 to 65 
C and pressures of ca. 1000-6000 psia. Almost without exception, the solubilityof amorphous polymers increases with a decrease in the cohesive energy density, or likewise,the surface tension of the polymer. With this decrease in surface tension, the polymer cohesiveenergy density becomes closer to that of CO2. Consequently, solubility is governed primarily bypolymer-polymer interactions, while polymer-CO2 interactions play a secondary role. Thesolubility is strongly dependent upon molecular weight for the less CO2-philic polymers. Thesolubilities of high-molecular-weight poly(fluoroalkoxyphosphazenes) in CO2 were comparableto those of poly(1,1-dihydroperfluorooctylacrylate), one of the most CO2-soluble polymers known.
C and pressures of ca. 1000-6000 psia. Almost without exception, the solubilityof amorphous polymers increases with a decrease in the cohesive energy density, or likewise,the surface tension of the polymer. With this decrease in surface tension, the polymer cohesiveenergy density becomes closer to that of CO2. Consequently, solubility is governed primarily bypolymer-polymer interactions, while polymer-CO2 interactions play a secondary role. Thesolubility is strongly dependent upon molecular weight for the less CO2-philic polymers. Thesolubilities of high-molecular-weight poly(fluoroalkoxyphosphazenes) in CO2 were comparableto those of poly(1,1-dihydroperfluorooctylacrylate), one of the most CO2-soluble polymers known.