Improved relationships for diffusion and sedimentation constants and for viscosity and streaming birefringence of solutions of polymers

Wiley - Tập 14 Số 74 - Trang 193-208 - 1954
Hans Kuhn1, W. Kühn1, A. Silberberg1
1Institute of Physical Chemistry, University of Basel, Switzerland

Tóm tắt

AbstractFor the description of the practical properties of a large number of linear polymer molecules as well as for the discussion of the various mean parameters of the individual chain molecule, the model usually employed to represent the molecule consists of N m straight line chain elements of length A m statistically joined to each other (straight element model). For the construction of large‐scale wire models of polymer molecules to be used in model experiments on the hydrodynamic behavior of chain molecules, a somewhat different model (circular segment model) was employed in previous papers. In these papers the relationships connecting the parameters which characterize these two models respectively have been determined on the basis of certain assumptions. These assumptions, as has recently been shown, were however partly in error and certain corrections have now to be applied to the numerical constants which appear in previously published formulas for the diffusion and sedimentation constants and for the intrinsic viscosity and streaming birefringence. The formulas, resulting after these corrections have been incorporated, are compiled in the present paper and the effect of these corrections on the interpretation of both new and old experimental results is discussed. It is found that agreement between theory and experiment is improved by the use of the corrected expressions and that in particular certain discrepancies which had previously existed between the lengths A m of the statistical chain element as calculated from sedimentation and diffusion experiments, on the one hand, and viscosity determinations on the other, disappear after these corrections are applied (see Table I).

Từ khóa


Tài liệu tham khảo

10.1007/BF01451681

10.1002/hlca.19430260514

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10.1016/0095-8522(48)90003-8

10.1002/pol.1952.120090101

See reference 2c p. 534 in particular.

See reference 2c p. 29 in particular.

See reference 2c p. 536 in particular.

See reference 2c p. 25 in particular.

See reference 2c p. 29 in particular.

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See reference 2b p. 346 in particular.

Kunst F. D., 1950, Proceedings of the International Colloquium on Macromolecules, Holland, 1949.

Newman S., Proceedings of the International Colloquium on Macromolecules, Holland, 1949.

10.1063/1.1746521

10.1002/hlca.19520350329

10.1039/tf9514700667

10.1021/ja01149a002

10.1021/ja01149a004

10.1002/hlca.19470300518

10.1063/1.1746948

10.1063/1.1746947

Thông tin
Thông tin xuất bản

Wiley

Tập 14 Số 74

193-208

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