1999
DOI: 10.1002/(sici)1099-0488(19990315)37:6<593::aid-polb11>3.0.co;2-n
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Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

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Cited by 46 publications
(49 citation statements)
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“…[18,41] These predictions are in satisfactory agreement with reported experimental results. [42][43][44] Diffusion measurements for slightly interacting polymers in the molten state and concentrated polymer solutions have been reported to be approximately consistent with the reptation model, which predicts that b ¼ 2 in Equation (3) for polymers with a MW above a critical value, M e , which is the molecular weight of the polymer chain between entanglements. [6,16,18,45] For short-chain polymers with a MW below M e , diffusion can be modeled successfully by considering a Rouse-like motion of monomer beads connected by entropic springs.…”
Section: Effect Of Molecular Weight Of Peg On the Interdiffusion Betwmentioning
confidence: 99%
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“…[18,41] These predictions are in satisfactory agreement with reported experimental results. [42][43][44] Diffusion measurements for slightly interacting polymers in the molten state and concentrated polymer solutions have been reported to be approximately consistent with the reptation model, which predicts that b ¼ 2 in Equation (3) for polymers with a MW above a critical value, M e , which is the molecular weight of the polymer chain between entanglements. [6,16,18,45] For short-chain polymers with a MW below M e , diffusion can be modeled successfully by considering a Rouse-like motion of monomer beads connected by entropic springs.…”
Section: Effect Of Molecular Weight Of Peg On the Interdiffusion Betwmentioning
confidence: 99%
“…However, the data for the low-MW PVP grades (M n 12 000 g Á mol À1 ) are fitted satisfactorily by a linear function ( Figure 11, solid line, R 2 ¼ 0.999) whose slope provides b ¼ 0.50, which is consistent with Zimm's model (1/2 < b 3/5) and similar experimental results for the diffusion of other polymers in good solvents. [42][43][44] It follows from the above analysis that the D 2 * value obtained for the high-MW PVP (M n ¼ 360 000 g Á mol À1 ) is most likely overestimated and is more characteristic of PVP with M n % 100 000 g Á mol À1 (shown by arrows in Figure 11). Such overestimation may be due to a broad molecular-weight distribution in the PVP samples used in this work (Table 1), which could lead to an enhanced emphasis on diffusion of polymer fractions with lower molecular weight towards neat PEG, especially for PVP samples with high average MW.…”
Section: The Effect Of the Molecular Weight Of Pvp On The Interdiffusmentioning
confidence: 99%
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“…The size of these structures in solution was calculated from the related diffusion coefficient using the Stokes-Einstein equation [28].…”
Section: Dynamic Light Scatteringmentioning
confidence: 99%
“…The latter can be achieved via concentration titration methods [6][7][8][9] or from a single measurement [10]. Mutual diffusion refers to the fluxes of solute and solvent molecules produced by changes or gradients in the concentration of the solution.…”
Section: Introductionmentioning
confidence: 99%