DOI: 10.1063/1.450928. Kinetics of near-critical quenches in homogeneous binary polymer mixtures

Kinetics of near-critical quenches in homogeneous binary polymer mixtures

10.1063/1.450928

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The dynamical response of a binary mixture of homopolymers in the vicinity of its critical point is investigated. We consider the situation in which the mixture is subjected to a rapid quench, with both initial and final equilibrium states in the homogeneous one-phase region, but near Tc. The theory of Kawasaki and Ohta for mixtures of small molecules is extended to the present case of high molecular weight polymer mixtures. The resulting equation of motion for the structure factor is expected to accurately describe the results of neutron and light scattering experiments subsequent to a rapid quench of a two-component polymer melt. Mode coupling terms in the kinetic equations that were neglected in previous treatments of critical dynamics in polymer mixtures are shown to be important for scattering wavelengths larger than the size of a coil and for temperatures and compositions sufficiently close to the critical point. In a narrow region surrounding the critical point we find that the mode coupling corrections lead to several new predictions for the linear dynamical response of polymer mixtures. One notable prediction is that the mutual diffusion coefficient is expected to scale like D∼N2e N−7/2‖1−χ/χs‖0.53, where Ne, N, χ, and χs are, respectively, the entanglement length, the chain length, the Flory interaction parameter, and the interaction parameter on the spinodal. The experimental consequences of the present results are discussed in some detail.

Bibliography

Fredrickson, G. H. (1986). Kinetics of near-critical quenches in homogeneous binary polymer mixtures. The Journal of Chemical Physics, 85(6), 3556â3565.

Authors 1

Glenn H. Fredrickson (first)

References 34 Referenced 26

{'key': '2024021003464106800_r1'}
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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:08 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 12:04 a.m.)
Indexed	1 year, 6 months ago (Feb. 10, 2024, 3:24 a.m.)
Issued	38 years, 11 months ago (Sept. 15, 1986)
Published	38 years, 11 months ago (Sept. 15, 1986)
Published Print	38 years, 11 months ago (Sept. 15, 1986)

Funders 0

None

BibTeX

@article{Fredrickson_1986, title={Kinetics of near-critical quenches in homogeneous binary polymer mixtures}, volume={85}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.450928}, DOI={10.1063/1.450928}, number={6}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Fredrickson, Glenn H.}, year={1986}, month=sep, pages={3556–3565} }

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