ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Data for a number of vinyl polymer-solvent systems show that the constant Ks in the relation 1/S = (1/S0) (1 + KsC) (where S and S0 are sedimentation constants at the concentration C and zero respectively) is proportional to the intrinsic viscosity. The average constant of proportionality is 1.6. Assuming the Mandelkern-Flory theory of the relation of frictional coefficient and intrinsic viscosity to root-mean-square end-to-end distance and Burgers' relation for the sedimentation constant of a dilute suspension of spheres, the ratio Ks/[η] is calculated to be 1.66. Molecular weights may be calculated from Ks and the limiting sedimentation constant, S0 without the use of the constants Φ and P, and agree well with molecular weights determined independently. These considerations apparently do not apply to cellulose derivatives, for which Ks is not proportional to [η].
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1954.120147307
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