✦ LIBER ✦

A method for estimating unperturbed chain dimension from molecular weight dependence of sedimentation and diffusion coefficients

✍ Scribed by K. Kamide; M. Saito

Publisher: Elsevier Science
Year: 1982
Tongue: English
Weight: 319 KB
Volume: 18
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(82)90094-5

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✦ Synopsis

AMtraet--A method tmethod 2L) has been proposed for evaluation of the unperturbed chain dimension A from the molecular weight dependence of the molecular friction coe~cient, derived from sedimentation and ditl'usion coefficients. This method is widely applicable when the unperturbed chain is non-Gaussian and;or the solvent molecules are semi-permeable through the polymer chain sphere {i.e. the solvent draining effect is not negligible). Literature data for cellulose and amylose derivative solutions have been analysed according to the method proposed here and the A values obtained thus are in good agreement with those by other methods for a non-Gaussian and draining chain.

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