✦ LIBER ✦

Conformation of cage polyelectrolytes in aqueous solution: halfway between charged and neutral macromolecules

✍ Scribed by G.J. Vancso; B.R. White; J.E. Guillet

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 297 KB
Volume: 29
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(93)90139-7

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✦ Synopsis

The conformation of the photozyme poly(sodium styrenesulphonate-co-2-vinylnaphthalene) (PSSS-VN) was studied in dilute aqueous solution by performing viscosity and various light scattering (LS) measurements on four PSSS-VN samples of different molar mass (Jl?w). From an analysis of the sequence distribution, the copolymer is made-up of mostly short SSS segments connected by longer VN sequences. The viscosity behaviour of PSSS-VN is typical of polyelectrolyte solutions. The value of b in the relationship D,.o ~ -~w b, where/Sz, o is the translational diffusion coet~cient of the polymer, was greater than the maximum value predicted for a flexible neutral polymer in a good solvent. Based on the depolarization ratio of the static LS intensity, the shape of the macromolecular coil is symmetrical. These results suggest that PSSS-VN forms a rigid random coil with flexible VN-rich joints and is more expanded than its neutral analogue of similar molar mass in a good solvent.

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