Advanced Materials for Membrane Separations by Ingo Pinnau and Benny D. Freeman (Eds.)

By Ingo Pinnau and Benny D. Freeman (Eds.)

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48. ; Laciak, D . V . J. Membrane Sci. 1997, 131, 49-60. 49. Ho, W. S. W. S. Patent 5,611,843, 1997. 50. Nagai, K . ; Freeman, B . D . ; Pinnau, I. Prog. Polym. Sci. 2001, 26, 721-798. 51. ; Toy, L . G. J. Membrane Sci. 1996, 116, 199-209. 52. ; Casillas, C . G . ; Morisato, A . ; Freeman, B . D . J. Polym. : Polym. Phys. Ed. 1996, 34, 2613-2621. 53. Cohen, M . H . ; Turnbull, D. J. Chem. Phys. 1959, 31, 1164-1169. 54. Pinnau, I; He, Z . S. Patent 6,316,684, 2001. 55. Merkel, T. C ; Freeman, B .

The numbers in parenthesis denote the statistical inaccuracy. s The solvation enthalpies are small (in absolute number) compared to the contributions of polymer reorganization and penetrant binding. The polymer reorganization energies are always positive, which is caused by the energetic penalty associated with creating a molecular sized cavity in the polymeric fluid. The penetrant binding energy to the polymeric fluid is always negative and, therefore, compensates for die former process to a large extent.

The contribution of penetrant binding and polymer reorganization energies to the gas solubility is discussed in detail. ; ACS Symposium Series; American Chemical Society: Washington, DC, 2004. ch003 40 Studies of gas and vapor solubility in polymeric solvents (/) play an important role in rationalizing the separation performance of solution-diffusion membranes. Because gas solubility is easily accessible experimentally, it has been widely studied and correlated to gas phase properties and polymer characteristics.

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