Effect of chain‐end free volume on the diffusion of oligomers

Meerwall, E. von; Grigsby, J.J.; Tomich, D. H.; Antwerp, R. Van

doi:10.1002/pol.1982.180200612

Cited by 77 publications

(49 citation statements)

References 44 publications

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“…Nevertheless, there are systematic shortcomings of the model which will shortly be discussed in the following points outlining a number of discrepancies with experimental findings. law predicted for limit (IV) DE appears to be corroborated at first sight by early studies [67,[78][79][80]. However, there are a number of effects that may influence the outcome of such measurements.…”

Section: Discussion and Modifications Of The Tube/reptation Modelsupporting

confidence: 50%

Molecular Dynamics in Polymers

Kimmich

2012

Principles of Soft-Matter Dynamics

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Suitably modified versions of the Langevin equation introduced in Chap. 2 will be taken as a general basis for analytical explanations of macromolecular-chain motions. The reader will straightforwardly be led from the dynamics of freely draining polymer chains as the simplest case to entangled-chain phenomena and finally to mesoscopic confinement effects. The Langevin equation-based treatments will be supplemented step by step by additional force terms specific for the diverse model scenarios. The restriction to this equation-of-motion strategy is expected to favor the comprehensibility of this demanding field. The relaxation-mode solutions will be expressed in the form of predictions for diverse experimental techniques outlined in Chap. 3. This in particular refers to spin-lattice relaxation, coherent and incoherent neutron scattering, and mechanical relaxation.

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Section: Discussion and Modifications Of The Tube/reptation Modelsupporting

confidence: 50%

Molecular Dynamics in Polymers

Kimmich

2012

Principles of Soft-Matter Dynamics

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“…The experiment was sensitive to permethe layers touched one another, h* (Fig. 6) began ability of solvent through the polymer layer 26 to rise monotonically. The rise in h*, by a factor rather than long-range diffusion of polymer of up to 5, is reasonable when one considers that chains.…”

Section: Reynolds Equation and Its Recent Implementa-mentioning

confidence: 99%

Apparent hydrodynamic thickness of densely grafted polymer layers in a theta solvent

Cho

Dhinojwala

Granick

1997

J. Polym. Sci. B Polym. Phys.

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“…While the predicted scaling laws for both the Rouse and reptation regimes have been confirmed for linear polymers, 7,8 fewer studies have examined the crossover region. Most have used polymer melts, where the concentration is not variable, to achieve high degrees of entanglement.…”

Section: Introductionmentioning

confidence: 99%

Self-Diffusion of Entangled Linear and Circular DNA Molecules: Dependence on Length and Concentration

2007

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Self-diffusion coefficients (D) of DNA molecules of varying length and concentration were measured by tracking the Brownian motion of individual fluorescently labeled tracer molecules. Four possible cases were examined: linear tracer molecules surrounded by linear molecules (L-L), circular tracers surrounded by linears (C-L), linear tracers surrounded by circles (L-C), and circles surrounded by circles (C-C). With 6 and 11 kilobasepair (kbp) DNA D was largely insensitive to topology and varied consistent with Rouse scaling (D ∼ L -1 C -0.5 ). In contrast, with 25 and 45 kbp DNA topology had a strong influence. At 1 mg/mL we foundIn the L-L, L-C, and C-C cases a crossover from scaling consistent with the Rouse model to scaling consistent with the reptation model (D ∼ L -2 C -1.75 ) was observed at ∼6 times the molecular overlap concentration. In contrast, D C-L decreased much more steeply with concentration, indicating that a process much slower than reptation governs that case.

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Effect of chain‐end free volume on the diffusion of oligomers

Cited by 77 publications

References 44 publications

Molecular Dynamics in Polymers

Molecular Dynamics in Polymers

Apparent hydrodynamic thickness of densely grafted polymer layers in a theta solvent

Self-Diffusion of Entangled Linear and Circular DNA Molecules: Dependence on Length and Concentration

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