Dynamics of Chain Molecules in Dilute Solutions, with Special Reference to Non-Newtonian Viscosity

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SEVERAl aspects of the phenomena appearing when chain molecules in dilute solutions are subjected to a velocity field seem to be satisfactorily explained by the theory which I have recently proposed1. In particular, the correct shape of the curve giving tan α (initial slope of extinction angle curve, as resulting from flow birefringence measurements) as a function of η0 (viscosity of solvent) has been obtained; quantitative agreement has been observed between the calculated and the measured slope of the asymptote to the preceding curve, in the case of polystyrene; the correct dependence on molecular weight of the internal viscosity term B in tan α has been obtained (proportionality of B to the molecular weight, as established experimentally by Leray for polystyrene2); and finally it has become possible to understand some of the characteristics of non-Newtonian viscosity.

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  1. 1

    Cerf, R., C.R. Acad. Sci., Paris, 240, 531 (1955); 241, 496, 1458 (1955); 243, 1875 (1956); 244, 456 (1957); J. Polymer Sci., 23, 125 (1957); 25, 247 (1957).

  2. 2

    Leray, J., C.R. Acad. Sci., Paris, 241, 1741 (1955).

  3. 3

    Cerf, R., C.R. Acad. Sci., Paris, 245, 1062 (1957).

  4. 4

    Čopič, M., J. Chim. Phys., 54, 348 (1957).

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    Golub, M., J. Phys. Chem., 60, 431 (1956).

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CERF, R. Dynamics of Chain Molecules in Dilute Solutions, with Special Reference to Non-Newtonian Viscosity. Nature 181, 558–559 (1958) doi:10.1038/181558a0

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