Abstract
The viscosity of prepared polymer solution was increased by the precipitation of Fe2+ with NaOH from the sewage of the T28 district,Shengtuo oilfiled. The mechanism of reduced viscosity introduced by Fe2+ was studied by IR,fluorescence spectroscopy and SEM. The viscosity of polymer solution was elevated from 19. 17 mPa·s to 92. 50 mPa·s when treating the sewage containing 5. 9 mg / L of Fe2+ with NaOH at pH 9.Fe2+ was found to split the polymer chain,weaken the association,destroy the spatial network structure of macromolecules,and lead to decreasing viscosity of the polymer solution. The precipitation of ferrous hydroxides from the polymer solution promotes the formation of compact spatial network structure of the polymer chains.
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