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Drag reduction and molecular structure. The interaction of polyethylenimine with some linear high polymers

✍ Scribed by C. A. Parker; Thelma A. Joyce

Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
665 KB
Volume
18
Category
Article
ISSN
0021-8995

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✦ Synopsis

The structure of polyethylenimine in aqueous and ethanolic solutions was investigated by measuring the fluorescence polarization of dansyl conjugates. In aqueous solutions, all polyethylenimines, whatever their molecular weight, are associated into large aggregates containing rotating units having rotary relaxat,ion times corresponding to spherical particles of molecular weight about 3-6 X lo3. The interaction of polyethylenimine with very dilute solutions of linear high polymers has been investigated by fluorescence polarization measurements and by the measurement of turbulent drag. Addition of polyethylenimine causes the solutions of anionic polymers to lose their capability of reducing turbulent drag. The results are discussed in relation to the proposed structure of the anionic-cationic complexes formed in the mixtures.

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## Abstract Several polymers with viologen structure were prepared by polymer analogous reaction with poly(vinyl alcohol) (PVA) and ethylcellulose (EC). The polymers were used as electron‐transfer catalysts (ETC) for the reduction of azobenzene, either in a Zn‐PV^2+^ system (reductant: Zn, in CH~3~