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Depolarized light scattering from semi-dilute polystyrene-carbon tetrachloride solutions

✍ Scribed by Erik Geissler; Ferenc Horkay; Anne-Marie Hecht; Walther Burchard

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
418 KB
Volume
30
Category
Article
ISSN
0014-3057

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✦ Synopsis

Polarized and depolarized light scattering measurements are reported for polystyrene-carbon tetrachloride solutions in the vicinity of the coil overlap concentration. The molecular weight of the polystyrene used in this experiment was M, = 2 x 107. The radius of gyration, determined in dilute solution conditions, was R~ = 196 nm. At volume fraction tp = 0.014, polarized light scattering yields a correlation length Β’ = 14.1 nm.

The depolarized light scattering intensity is practically independent of concentration. The characteristic lengths describing the depolarized spectra are much larger than those for the polarized scattering, and are of the order of 100 nm. These lengths are consistent with estimates of the distance between entanglements in the solutions.

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