Effects of Ethylene Oxide Spacer Length on Solution Properties of Water-Soluble Fluorocarbon-Containing Hydrophobically Associating Poly(Acrylic Acid-co-R_f-PEG Macromonomer)

摘要

Poly(acrylic acid)s (PAAs) modified with a series of fluorocarbon group (R_f) end-capped Poly(ethylene glycol) (PEG) macromonomers (number of ethylene oxide unit: 1, 9, 23, 45) and corresponding copolymers without fluorocarbon end groups were synthesized. It was found that the effect of the hydrophobic association of fluorocarbon groups on the solution viscosity prevailed over that of the hydrogen bond between grafted PEG and the backbone. Rheological measurement on the aqueous solutions of these poly(acrylic acid-co-R-f-PEG macromonomer)s demonstrated that the best thickening performance was shown when the number of ethylene oxide unit (EO number) was 23.