✦ LIBER ✦

Examples of the determination of molecular weight distributions by dynamic light scattering

✍ Scribed by J. Raczek

Publisher: Elsevier Science
Year: 1982
Tongue: English
Weight: 672 KB
Volume: 18
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(82)90019-2

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✦ Synopsis

Dynamic light scattering {DLS) is used to determine the molecular weight distributions of seven polystyrene samples in toluene at 20'C. applying a new procedure. This procedure makes possible inter alia--the elimination of all effects due to concentration and intramolecular interference, known to be considerable for the scattering system in question. The seven samples possessed molecular weights in the range 2.5-105 < M,, ~< 5.106 and differing non-uniformities (= relative widths of the MWDs). The results so obtained agree well with those obtained by other experimental methods. Further, it is shown that the procedure also gives a simple and accurate means of determining whether any individual experimental DLS-curve is distorted, without tiny prior knowledge of the scattering system being necessary.

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