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Volumn 29, Issue 19, 1996, Pages 6193-6207

Small-molecule probe diffusion in polymer solutions: Studies by Taylor dispersion and phosphorescence quenching

Author keywords

[No Author keywords available]

Indexed keywords

ASPECT RATIO; DIFFUSION; PHOSPHORESCENCE; POLYSTYRENES; PROBES; QUENCHING; SOLUTIONS; THERMAL EFFECTS; VOLUME FRACTION;

EID: 0030576750     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma960635b     Document Type: Article
Times cited : (44)

References (111)
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    • Guo, C. J.; De Kee, D.; Harrison, B. J. Appl. Polym. Sci. 1995, 56, 817; 1995, 56, 823.
    • (1995) J. Appl. Polym. Sci. , vol.56 , pp. 823
  • 68
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    • note
    • D, the apparent activation energy for diffusion.
  • 78
    • 4243192393 scopus 로고    scopus 로고
    • Ph.D. Thesis, Northwestern University, Evanston, IL
    • Wisnudel, M. B. Ph.D. Thesis, Northwestern University, Evanston, IL, 1996.
    • (1996)
    • Wisnudel, M.B.1
  • 86
    • 33645828258 scopus 로고
    • probe in the limit of zero polymer concentration. Solvent diffusion data have reportedly deviated from free volume theory at extremely high solvent concentrations when Fujita free volume theory was fit to diffusivities in polyisobutylene-benzene (Boss, B. D.; Stejskal, E. O.; Ferry, J. D. J. Phys. Chem. 1967, 71, 1501) and oil - Natsyn (von Meerwall, E. D.; Ferguson, R. D. J. Appl. Polym. Sci. 1979, 23, 877) systems over very broad ranges of concentration (from 0 to ≥ 0.7 volume fraction polymer). An extra increase in diffusivity unrelated to free volume in dilute solution might be expected on the basis of a hypothesis by Cohen and Turnbull (ref 61) that the diffusivity of a molecule in dilute solution might be higher due to motion of the cage (cooperativity between polymer and solvent) than if the cage were fixed (polymer-fixed reference frame). Also see ref 60. Based on these hydrodynamic considerations, one might expect a transition in diffusivity near the polymer overlap concentration that no free volume theory could adequately describe. We do not observe such a disparity between Vrentas-Duda theory and our data, although additional measurements below 100 g/L polymer concentration would need to be made in order to reach a more definitive conclusion. Furthermore, comparisons of Fujita free volume theory to the data should be re-evaluated in consideration of recent improvements to the theory (Fujita, H. Macromolecules 1993, 26, 643).
    • (1967) J. Phys. Chem. , vol.71 , pp. 1501
    • Boss, B.D.1    Stejskal, E.O.2    Ferry, J.D.3
  • 87
    • 0018434104 scopus 로고
    • probe in the limit of zero polymer concentration. Solvent diffusion data have reportedly deviated from free volume theory at extremely high solvent concentrations when Fujita free volume theory was fit to diffusivities in polyisobutylene-benzene (Boss, B. D.; Stejskal, E. O.; Ferry, J. D. J. Phys. Chem. 1967, 71, 1501) and oil - Natsyn (von Meerwall, E. D.; Ferguson, R. D. J. Appl. Polym. Sci. 1979, 23, 877) systems over very broad ranges of concentration (from 0 to ≥ 0.7 volume fraction polymer). An extra increase in diffusivity unrelated to free volume in dilute solution might be expected on the basis of a hypothesis by Cohen and Turnbull (ref 61) that the diffusivity of a molecule in dilute solution might be higher due to motion of the cage (cooperativity between polymer and solvent) than if the cage were fixed (polymer-fixed reference frame). Also see ref 60. Based on these hydrodynamic considerations, one might expect a transition in diffusivity near the polymer overlap concentration that no free volume theory could adequately describe. We do not observe such a disparity between Vrentas-Duda theory and our data, although additional measurements below 100 g/L polymer concentration would need to be made in order to reach a more definitive conclusion. Furthermore, comparisons of Fujita free volume theory to the data should be re-evaluated in consideration of recent improvements to the theory (Fujita, H. Macromolecules 1993, 26, 643).
    • (1979) J. Appl. Polym. Sci. , vol.23 , pp. 877
    • Von Meerwall, E.D.1    Ferguson, R.D.2
  • 88
    • 0027539811 scopus 로고
    • probe in the limit of zero polymer concentration. Solvent diffusion data have reportedly deviated from free volume theory at extremely high solvent concentrations when Fujita free volume theory was fit to diffusivities in polyisobutylene-benzene (Boss, B. D.; Stejskal, E. O.; Ferry, J. D. J. Phys. Chem. 1967, 71, 1501) and oil - Natsyn (von Meerwall, E. D.; Ferguson, R. D. J. Appl. Polym. Sci. 1979, 23, 877) systems over very broad ranges of concentration (from 0 to ≥ 0.7 volume fraction polymer). An extra increase in diffusivity unrelated to free volume in dilute solution might be expected on the basis of a hypothesis by Cohen and Turnbull (ref 61) that the diffusivity of a molecule in dilute solution might be higher due to motion of the cage (cooperativity between polymer and solvent) than if the cage were fixed (polymer-fixed reference frame). Also see ref 60. Based on these hydrodynamic considerations, one might expect a transition in diffusivity near the polymer overlap concentration that no free volume theory could adequately describe. We do not observe such a disparity between Vrentas-Duda theory and our data, although additional measurements below 100 g/L polymer concentration would need to be made in order to reach a more definitive conclusion. Furthermore, comparisons of Fujita free volume theory to the data should be re-evaluated in consideration of recent improvements to the theory (Fujita, H. Macromolecules 1993, 26, 643).
    • (1993) Macromolecules , vol.26 , pp. 643
    • Fujita, H.1
  • 101
    • 85033818816 scopus 로고    scopus 로고
    • note
    • To our knowledge, phosphorescence of 3,4-hexanedione has not been reported elsewhere.
  • 108
    • 85033810214 scopus 로고    scopus 로고
    • note
    • Cohen and Turnbull (ref 61) state that "if the impurity molecule (probe) is smaller than the solvent molecule ..., it will diffuse at the same rate as the solvent since the diffusive transport is completed only by the jumping of a neighboring solvent molecule into the void."
  • 109
    • 85033821781 scopus 로고    scopus 로고
    • note
    • probe,s was determined.
  • 111
    • 0027114514 scopus 로고
    • probe,s which is too large to allow inclusion in Figure 12. Since probe-polymer interactions complicate studies of probe diffusion in solution, they were avoided in this study as much as possible. We are unaware of any interactions between the probes of Figure 1 and polystyrene that may have led to anomalous diffusion. Furthermore, phosphorescence quenching interactions involving two of the probes, anthracene and benzil, in another study (ref 56) were well-behaved in a number of polymer solutions including polystyrene, poly(methyl methacrylate), and poly butadiene.
    • (1992) Macromolecules , vol.25 , pp. 6977
    • Lee, J.1    Park, K.2    Chang, T.3    Jung, J.C.4


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.