Diffusion of polystyrene in tetrahydrofuran

Mandema, W.; Zeldenrust, H.

doi:10.1016/0032-3861(77)90191-4

Cited by 94 publications

(38 citation statements)

References 13 publications

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“…The diffusion coefficients were calculated from the known molecular masses by applying the often-used relation D 0 ϭ 3.8 ϫ 10 Ϫ8 M Ϫ0.564 for PS in THF as determined with DLS by Mandema and Zeldenrust. 1 The calibration curves of the HDC and SEC experiments are shown in Figure 1.…”

Section: Calibrationmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

Mes¹,

Kok²,

Poppe³

et al. 1999

J. Polym. Sci. B Polym. Phys.

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Section: Calibrationmentioning

confidence: 99%

“…(1) and (2)], to relate the migration rate of a polymer via the hydrodynamic radius to its diffusion coefficient. This has recently been shown for the coupling of ThFFF and HDC.…”

Section: Hydrodynamic Chromatographymentioning

confidence: 99%

Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

Mes¹,

Kok²,

Poppe³

et al. 1999

J. Polym. Sci. B Polym. Phys.

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“…Each point in this figure corresponds to the mean value of three measurements. The molecular diffusion coefficient for a given molecular mass was determined using the empirical relationship D = 3.45.10 -4 cm z s -t M -°'se4, which was found for PS in THF (T= 24°C) with the use of dynamic light scattering [47]. According to the well known Stokes-Einstein equation ( …”

Section: Sec Calibrationmentioning

confidence: 99%

“…12 [with P(/~) ~./~ -1] could be employed to obtain the/L values of the fractions. The mass selectivity can be rearranged to [43]: ' Calculated with b = 0.564 [47].…”

Section: Test Of the Sec Sampling Processmentioning

confidence: 99%

Determination of the compositional heterogeneity of polydisperse polymer samples by the coupling of size-exclusion chromatography and thermal field-flow fractionation

Asten

Dam

Kok

et al. 1995

Journal of Chromatography A

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Determination of the compositional heterogeneity of polydisperse polymer samples by the coupling of size-exclusion chromatography and thermal field-flow fractionation van Asten, A.C.; van Dam, R.J.; Kok, W.T.; Tijssen, R.; Poppe, H. Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. An off-line coupling of size-exclusion chromatography (SEC) and thermal field-flow fractionation (ThFFF) was used successfully to cross-fractionate copolymers and polymer blends. Various fractions of different molecular mass were obtained from polydisperse polymer samples by SEC. Because the molecular diffusion coefficients were known, the ThFFF analysis of these fractions yielded directly thermal diffusion coefficients. As thermal difftcion is strongly affected by the chemical nature of the polymer, the chemical composition of polymer samples can be studied as function of the molecular mass with this technique. This is illustrated with the SEC-ThFFF crossfractionation of a polystyrene sample blended with a polybutadiene and a polytetrahydrofuran standard, and of butadiene-and styrene-methylmethacrylate copolymers.

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“…The lines in the figure represent the theoretical values predicted using Eq. (1); literature values for the diffusion coefficients of 1.78 and 0.65 x 10 -11 m 2 s -1 [15] were used to calculate these lines. It is apparent that there is reasonable agreement between the observed retention times and the theory.…”

Section: Applicationsmentioning

confidence: 99%

Practical experience with organic solvent flow field-flow fractionation

et al. 1996

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SummarySeveral types of membrane have been tested for use in organic solvent flow field-flow fractionation in an asymmetric channel. The practical problems most commonly encountered were leakage of air and solvent through the SUpport layer on which the membranes are cast, and Unequal swelling of the membrane and the support layer m the organic solvent, leading to ridging of the membrane in the channel. Three types of membrane Were found suitable for the separation of polystyrene standards with tetrahydrofuran as solvent. The best results were obtained with a fluoropolymer membrane. l~air agreement was found between theory and practice for the dependence of retention times on the relative molecular mass of the standards and on the flow regime. Use of scanning electron microscopy revealed that for a rmmber of the membrane materials some pores were touch larger than expected on the basis of the indicated molecular weight cut-off. Whereas these materials could ~aot be used for the ffactionation of soluble polymers, they could be applied with some success to the separation of solid latex and silica particles. A PTFE membrane could be used for the separation of latexes and silica particles suspended in acetonitrile as carrier liquid. In general, however, the retention times of these Particles were shorter than theoretically predicted.

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Diffusion of polystyrene in tetrahydrofuran

Cited by 94 publications

References 13 publications

Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

Determination of the compositional heterogeneity of polydisperse polymer samples by the coupling of size-exclusion chromatography and thermal field-flow fractionation

Practical experience with organic solvent flow field-flow fractionation

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