✦ LIBER ✦

Intramolecular mobility of spin labelled poly(vinylpyrrolidone) and poly(vinylcaprolactam) in solutions

✍ Scribed by A.M. Wasserman; V.P. Timofeev; T.A. Aleksandrova; T.M. Karaputadze; A.B. Shapiro; Yu.E. Kirsch

Book ID: 103076706
Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 426 KB
Volume: 19
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(83)90169-6

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✦ Synopsis

The intramolecular (segmental) mobilities of poly(vinylpyrrolidone) and poly(vinylcaprolactam) in solutions have been investigated using the spin label technique. The rotational correlation times for the segments do not depend on the spin label used for their determination. The rotational correlation times and the effective segmental dimensions for poly(vinylcaprolactam) are greater than those for poly(vinylpyrrolidone), the difference being due to different dimensions of the side-groups of the macromolecules. Near the temperature of phase separation in an aqueous solution of poly-(vinylcaprolactam), the hydrophobic interaction of macromolecular side-groups leads to the compression of the molecular coil. As a result, the segmental mobility diminishes, and the spatial limitations on the rotation of a spin label surrounded by bulky side-groups become more severe.

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