DOI: 10.1063/1.430557. Photon correlation study of polydisperse samples of polystyrene in cyclohexane

Photon correlation study of polydisperse samples of polystyrene in cyclohexane

10.1063/1.430557

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Three samples of polystyrene in cyclohexane were studied at the theta temperature by photon correlation spectroscopy. The photon correlation data were analyzed using the moments (or cumulants) method which, under appropriate conditions, yields the Z−average diffusion coefficient ?Z of the solute and one or two higher moments of the diffusion coefficient distribution [D.E. Koppel, J. Chem. Phys. 57, 4814 (1972)]. ?Z can be combined in the Svedberg equation with the weight−average sedimentation coefficient to yield the weight−average molecular weight. The samples studied comprised an essentially monodisperse fraction of polystyrene, a mixture of two monodisperse fractions and a single fraction of broader molecular weight distribution; they had been extensively characterized by other techniques. Our results indicate that, indeed, the Z−average diffusion coefficient is provided by the moments−analysis method. The values of ?W obtained from the Svedberg equation were, within experimental error, in good agreement with those determined by other techniques. The second moment of the diffusion coefficient distribution provides a useful index of polydispersity.

Bibliography

Brown, J. C., Pusey, P. N., & Dietz, R. (1975). Photon correlation study of polydisperse samples of polystyrene in cyclohexane. The Journal of Chemical Physics, 62(3), 1136â1144.

Authors 3

Judith C. Brown (first)
P. N. Pusey (additional)
R. Dietz (additional)

References 31 Referenced 243

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{'key': '2024020912385414300_r1f'}
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10.1021/bi00702a020 / Biochemistry (1974)
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{'key': '2024020912385414300_r4'}
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Dates

Type	When
Created	22 years, 5 months ago (Feb. 27, 2003, 4:56 p.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 8:29 a.m.)
Indexed	3 weeks, 1 day ago (Aug. 2, 2025, 12:46 a.m.)
Issued	50 years, 6 months ago (Feb. 1, 1975)
Published	50 years, 6 months ago (Feb. 1, 1975)
Published Print	50 years, 6 months ago (Feb. 1, 1975)

Funders 0

None

BibTeX

@article{Brown_1975, title={Photon correlation study of polydisperse samples of polystyrene in cyclohexane}, volume={62}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.430557}, DOI={10.1063/1.430557}, number={3}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Brown, Judith C. and Pusey, P. N. and Dietz, R.}, year={1975}, month=feb, pages={1136–1144} }

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