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Sedimentation velocity of polymer solutions—I. Concentration dependence of the sedimentation coefficient

✍ Scribed by W.J. Closs; B.R. Jennings; H.G. Jerrard

Publisher
Elsevier Science
Year
1968
Tongue
English
Weight
572 KB
Volume
4
Category
Article
ISSN
0014-3057

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✦ Synopsis

Abstraet--A study has been made of the concentration dependence of the sedimentation coefficient S of the two 0 systems (I) polymethylmcthacrylate in n-butyl chloride at 35 ° and (II) polystyrene in cyclohexane at 34°; also for the non-0 system CIII) polyisobuty[ene in cyclohexane at 34 °. In each case, the behaviour was well represented by the equation.

[S~o]-1 = [Sol -~ (1 + kCo)

where subscripts Co and 0 represent intital concentrations of Co and zero respectively. Values for k are 251 4-53, 72 4-22 and 721 4-159 ml.g -x for systems I, II and III respectively. Results for systems I and II thus indicate that, under 0 conditions, k does not equal zero. Furthermore, when combined with other reported data, the results for system II indicate the suitability of the recent theory of Pyun and Fixman for the frictional coefficients of polymer molecules in solution.

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