Polymer translational diffusion: 2. Non-theta solutions, polystyrene in butan-2-one

King, Terence A.; Knox, A.; McAdam, J.D.G.

doi:10.1016/0032-3861(73)90120-1

Cited by 49 publications

(13 citation statements)

References 12 publications

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“…Only the three highest molecular weights reported by these investigators are presented in Figure 8, since they implied in their paper that the data for the lower molecular weights were questionable. The methyl ethyl ketone data of McDonnell and Jamieson and the data of King et al (1973b) for this solvent above a molecular weight of 2 x 105 are reasonably well represented by a value of B slightly greater than 0.5 x cmJ. This value falls between the value of B = 0.76 x loez7 cm3 reported by Berry and Casassa (1970) and the values derived from intrinsic viscosity data and presented in Table 1.…”

Section: Determination Of Kdsupporting

confidence: 66%

“…Data for the solvents methyl ethyl ketone, toluene, and THF, taken primarily using narrow polystyrene fractions, are included in Figure 5. Lines drawn through the points representing the toluene data of Meyerhoff and Nachtigall (1962) and the methyl ethyl ketone data of King et al (1973b) and of Tsvetkov and Klenin (1958) would be in reasonable agreement with the shapes of the theoretical curves. Furthermore, as is discussed in detail elsewhere (Vrentas and Duda, 1976a), the values of B which fit these diffusivity data are in reasonably good agreement with values of this parameter determined from unrelated experiments, especially when the slow change of D o / ( D o ) e with B for good solvents is considered.…”

Section: Determination Of Do For Nantheta Solutionssupporting

confidence: 65%

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Molecular diffusion in polymer solutions

1979

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The growth of the polymer industry has been spectacular, and the volumetric production of polymers will soon exceed that of all metals. Initially, this growth was due mainly to the synthesis of new polymers. However, it appears that continued growth will be more directly associated with sophisticated engineering which will lead to improved processes and new applications ( h4arkovitq 1971, 1972). Diffusion coefficients for polymer solutions are required for the analysis of many polymer formation and fabrication processes. The importance of mass transfer is perhaps most prominent in the formation of polymers, where the rate of polymerization can be controlled or strongly influenced by the molecular diffusion of monomers, initiators, long chain free radicals, dead polymer chains, or low molecular weight condensation products.

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Section: Determination Of Kdsupporting

confidence: 66%

Section: Determination Of Do For Nantheta Solutionssupporting

confidence: 65%

Molecular diffusion in polymer solutions

1979

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“…The measured value of D, 6.2(±0.1) x w-s cm 2 s-1 , is in good agreement with the relation between log <D> and log <Mw) obtained by King et a/. 9 Using the Einstein-Stokes formula, the hydrodynamic radius is calculated as 8.8 x 10-6 em. This is 72% of Rg.…”

Section: Methodssupporting

confidence: 88%

Quasi-Elastic Light Scattering Study of Concentration Dependence of Diffusion and Internal Motion in Chain Polymers

Nishio

Wada

1980

Polym J

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Solutions of polystyrene (M" = 1.0 x I 0 7) in 2-butanone (ethyl methyl ketone), in a concentration range 0.1 mg cc-1 to !Omgcc-1 , were studied using Quasi-Elastic Light Scattering. The relation of diffusion-like fluctuations in highly concentrated polymer solutions (cooperative diffusion) to the internal motion of single polymers was explored. We observed that when the concentration of a solution was brought from a dilute region to a highly concentrated region, the Rayleigh line spectrum clearly showed that the internal motion had changed from intramolecular motion within a single polymer to cooperative diffusion. We also analyzed the relaxation time of the lowest mode of the internal motion of single polymers in terms of the bead and spring model.

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“…The concentration dependence of the diffusion coefficient, D, in the volumefixed frame of reference has been the subject of several experimental studies (25)(26)(27). First it should be noted that hydrodynamic and molecular calculations usually determine diffusion coefficients, Dts), in a reference frame in which macromolecules move relative to the solvent.…”

Section: Diffusion Of Macromoleculesmentioning

confidence: 99%

“…First it should be noted that hydrodynamic and molecular calculations usually determine diffusion coefficients, Dts), in a reference frame in which macromolecules move relative to the solvent. The relationship between D~ and D is given by the well-known formula (27)…”

Section: Diffusion Of Macromoleculesmentioning

confidence: 99%