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Evaluation of excluded-volume parameters from light-scattering results by means of graphical procedures

✍ Scribed by G. Glöckner

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
691 KB
Volume
16
Category
Article
ISSN
0014-3057

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✦ Synopsis

A description is given of a straightforward graphical procedure for evaluation of the excludedvolume parameter and the unperturbed dimensions of polymer coils from light-scattering data measured in good solvents. Its basis is the fitting of the appropriate theoretical curves for the interpenetration function i h(i) and for the expansion factor ,, to the experimental points by joint shifting along a suitable logarithmic axis. The condition for the correct shift is derived from the value of the extended-volume parameter, and this is determinated by the basic relation between molar mass and radius of gyration. The curve-fining procedure is applied to certain light-scattering measurements and compared with the linearization methods most frequently used.

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