✦ LIBER ✦

Light-scattering of polyamide hydrazide solutions and conformational characteristics of its molecules

✍ Scribed by V.N. Tsvetkov; S.O. Tsepelevich

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 427 KB
Volume: 19
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(83)90140-4

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✦ Synopsis

Light-scattering measurements have been carried out Ior 18 samples of polyamide hydrazide (PAH} in dimethylsulphoxide (DMS) with an over 10-fold variation in molecular weights. It was shown that the excluded volume effect in DMS does not appreciably affect the size of PAH molecules. The length of the Kuhn seg~_ment (A ,-240.10 Scm) was estimated from the experimental determinations of molecular weights M,, and the radii of gyration (Re):. Viscometric determination of the rigidity of PAH chains yields the value of A --_ 200.10 Scm and the hydrodynamic diameter d ~ 5. 10 8cm. The whole collection of data shows that PAH is a typical rigid-chain polymer: the extended conformation is due to the backbone rigidity tather than to the excluded volume effects.

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