Generality of anomalous expansion of polymer chains in supercritical fluids

Tadanori Koga, P. Gin, H. Yamaguchi, M. K. Endoh, M. Asada, L. Sendogdular, M. Kobayashi, Atsushi Takahara, B. Akgun, S. K. Satija, T. Sumi

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

By using in-situ neutron reflectivity, we have investigated swelling isotherms of solvophilic and solvophobic end-grafted/non-grafted polymer chains on solid substrates in supercritical carbon dioxide and supercritical ethane. It was found that anomalous expansion of the polymer chains associated with excess absorption of the fluid molecules occurs in the large compressible regions of both supercritical fluids (SCFs) regardless of the polymer-fluid interactions. In addition, we found that the excess expansion of the solvophobic polymer chains in both SCFs collapse onto one master curve under the same magnitude of density fluctuations in the fluids. A simple thermodynamic two-state model along with the experimental results proposes that polymer chains are expanded independently of the polymer-fluid interactions to further change solvent density fluctuations around the polymer chains, thereby lowering the free energy of the polymer/SCF systems.

Original languageEnglish
Pages (from-to)4331-4336
Number of pages6
Journalpolymer
Volume52
Issue number19
DOIs
Publication statusPublished - Sep 1 2011

Fingerprint

Supercritical fluids
Polymers
Fluids
Ethane
Carbon Dioxide
Free energy
Isotherms
Swelling
Carbon dioxide
Neutrons
Thermodynamics
Molecules
Substrates

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Koga, T., Gin, P., Yamaguchi, H., Endoh, M. K., Asada, M., Sendogdular, L., ... Sumi, T. (2011). Generality of anomalous expansion of polymer chains in supercritical fluids. polymer, 52(19), 4331-4336. https://doi.org/10.1016/j.polymer.2011.07.039

Generality of anomalous expansion of polymer chains in supercritical fluids. / Koga, Tadanori; Gin, P.; Yamaguchi, H.; Endoh, M. K.; Asada, M.; Sendogdular, L.; Kobayashi, M.; Takahara, Atsushi; Akgun, B.; Satija, S. K.; Sumi, T.

In: polymer, Vol. 52, No. 19, 01.09.2011, p. 4331-4336.

Research output: Contribution to journalArticle

Koga, T, Gin, P, Yamaguchi, H, Endoh, MK, Asada, M, Sendogdular, L, Kobayashi, M, Takahara, A, Akgun, B, Satija, SK & Sumi, T 2011, 'Generality of anomalous expansion of polymer chains in supercritical fluids', polymer, vol. 52, no. 19, pp. 4331-4336. https://doi.org/10.1016/j.polymer.2011.07.039
Koga T, Gin P, Yamaguchi H, Endoh MK, Asada M, Sendogdular L et al. Generality of anomalous expansion of polymer chains in supercritical fluids. polymer. 2011 Sep 1;52(19):4331-4336. https://doi.org/10.1016/j.polymer.2011.07.039
Koga, Tadanori ; Gin, P. ; Yamaguchi, H. ; Endoh, M. K. ; Asada, M. ; Sendogdular, L. ; Kobayashi, M. ; Takahara, Atsushi ; Akgun, B. ; Satija, S. K. ; Sumi, T. / Generality of anomalous expansion of polymer chains in supercritical fluids. In: polymer. 2011 ; Vol. 52, No. 19. pp. 4331-4336.
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