Influence of carbon dioxide swelling on the closed-loop phase behavior of block copolymers

Kristopher A. Lavery, James D. Sievert, James J. Watkins, Thomas P. Russell, Du Yeol Ryu, Jin Kon Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The influence of carbon dioxide sorption on the closed-loop phase diagram of polystyrene-block-poly(n-pentyl methacrylate) copolymers, PS-b-PnPMA, was investigated. Differential dilation of the constituent blocks was used to induce microphase separation of the PS-b-PnPMA. With increasing carbon dioxide loading an appreciable expansion in the size of the closed loop was found. At a carbon dioxide activity of 0.1 the upper order-to-disorder transition temperature (UODT) was elevated by more than 20°C, whereas the lower disorder-to-order transition temperature (LDOT) was depressed by the same magnitude. This arises from the entropic nature of the closed-loop miscibility gap in this weakly interacting system, where microphase separation is driven by disparity in free volumes between dissimilar segments of the chain.

Original languageEnglish
Pages (from-to)6580-6583
Number of pages4
JournalMacromolecules
Volume39
Issue number19
DOIs
Publication statusPublished - 2006 Sep 19

Fingerprint

Phase behavior
Carbon Dioxide
Block copolymers
Swelling
Microphase separation
Carbon dioxide
Superconducting transition temperature
Methacrylates
Polystyrenes
Free volume
Phase diagrams
Sorption
Copolymers
Solubility

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Lavery, K. A., Sievert, J. D., Watkins, J. J., Russell, T. P., Ryu, D. Y., & Kim, J. K. (2006). Influence of carbon dioxide swelling on the closed-loop phase behavior of block copolymers. Macromolecules, 39(19), 6580-6583. https://doi.org/10.1021/ma060329q
Lavery, Kristopher A. ; Sievert, James D. ; Watkins, James J. ; Russell, Thomas P. ; Ryu, Du Yeol ; Kim, Jin Kon. / Influence of carbon dioxide swelling on the closed-loop phase behavior of block copolymers. In: Macromolecules. 2006 ; Vol. 39, No. 19. pp. 6580-6583.
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Lavery, KA, Sievert, JD, Watkins, JJ, Russell, TP, Ryu, DY & Kim, JK 2006, 'Influence of carbon dioxide swelling on the closed-loop phase behavior of block copolymers', Macromolecules, vol. 39, no. 19, pp. 6580-6583. https://doi.org/10.1021/ma060329q

Influence of carbon dioxide swelling on the closed-loop phase behavior of block copolymers. / Lavery, Kristopher A.; Sievert, James D.; Watkins, James J.; Russell, Thomas P.; Ryu, Du Yeol; Kim, Jin Kon.

In: Macromolecules, Vol. 39, No. 19, 19.09.2006, p. 6580-6583.

Research output: Contribution to journalArticle

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AB - The influence of carbon dioxide sorption on the closed-loop phase diagram of polystyrene-block-poly(n-pentyl methacrylate) copolymers, PS-b-PnPMA, was investigated. Differential dilation of the constituent blocks was used to induce microphase separation of the PS-b-PnPMA. With increasing carbon dioxide loading an appreciable expansion in the size of the closed loop was found. At a carbon dioxide activity of 0.1 the upper order-to-disorder transition temperature (UODT) was elevated by more than 20°C, whereas the lower disorder-to-order transition temperature (LDOT) was depressed by the same magnitude. This arises from the entropic nature of the closed-loop miscibility gap in this weakly interacting system, where microphase separation is driven by disparity in free volumes between dissimilar segments of the chain.

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