Synthesis of novel associating water-soluble copolymers
Poly(N,N-dimethylacrylamide) (4 samples) and Poly(N-acryl-N- methylpiperazine) (10 samples) were prepared by anionic polymerization in THF at {minus}78{degrees} in the presence of Cs or coordinated Li counter cations. Molecular weights (SEC) range from 3800--250,000. The polymers are soluble in methanol, H{sub 2}O and chloroform and to a lesser extent, in THF and CH{sub 2}Cl{sub 2}. 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 (HOCH{sub 2}CH{sub 2}SH) and water-insoluble (C{sub 12}H{sub 25}SH) 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.
- Research Organization:
- University of Southern California, Los Angeles, CA (United States). Dept. of Chemistry
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-89ER45407
- OSTI ID:
- 6187799
- Report Number(s):
- DOE/ER/45407-T1; ON: DE92002823
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPOLYMERS
CHEMICAL PREPARATION
AQUEOUS SOLUTIONS
CELLULOSE
ELECTROLYTES
FLUORINATED ALIPHATIC HYDROCARBONS
PROGRESS REPORT
SHEAR
VISCOSITY
CARBOHYDRATES
DISPERSIONS
DOCUMENT TYPES
HALOGENATED ALIPHATIC HYDROCARBONS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYSACCHARIDES
SACCHARIDES
SOLUTIONS
SYNTHESIS
360601* - Other Materials- Preparation & Manufacture