Actions for Synthesis of novel associating water-soluble copolymers [electronic resource].

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Synthesis of novel associating water-soluble copolymers [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (5 pages) : digital, PDF file
Additional Creators
University of Southern California, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Poly(N,N-dimethylacrylamide) (4 samples) and Poly(N-acryl-N- methylpiperazine) (10 samples) were prepared by anionic polymerization in THF at −78° in the presence of Cs or coordinated Li counter cations. Molecular weights (SEC) range from 3800--250,000. The polymers are soluble in methanol, H₂O and chloroform and to a lesser extent, in THF and CH₂Cl₂. Molecular weight distributions were found to be fairly monodisperse (1.11 < D < 2.69). (See Proposed Research''). Static and dynamic light scattering experiments performed on solutions of hydrophobically associating polyacrylamide copolymers illuminate the underlying molecular basis for the previous observations. Aggregation effects for these polymers are observed at polymer concentrations as low as 10 ppm. These effects are manifest by large radii of multichain aggregates as well as radii attributed to collapsed chains. Fluorine-10 NMR studies were undertaken in order to determine the content of fluorine-containing comonomer in a series of acrylamide copolymers. These results indicated that comonomer conversion is essentially quantitative. Addition of water-soluble (HOCH₂CH₂SH) and water-insoluble (C₁₂H₂₅SH) radical scavengers indicates that the water-soluble scavenger is effective in reducing molecular weight. The water-soluble scavenger essentially has no effect. This appears to indicate that the polymerization occurs exclusively in the aqueous phase.
Report Numbers
E 1.99:doe/er/45407-t1
doe/er/45407-t1
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Note
Published through SciTech Connect.
01/01/1991.
"doe/er/45407-t1"
"DE92002823"
Amis, E.J.; Hogen-Esch, T.E.
Funding Information
FG03-89ER45407
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