Abstract
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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References
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).
Leray, J., C.R. Acad. Sci., Paris, 241, 1741 (1955).
Cerf, R., C.R. Acad. Sci., Paris, 245, 1062 (1957).
Čopič, M., J. Chim. Phys., 54, 348 (1957).
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). https://doi.org/10.1038/181558a0
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DOI: https://doi.org/10.1038/181558a0
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