Abstract

The solution behavior of various types of ionomers is reviewed in different solvent systems. Metal neutralized carboxylate and sulfonate ionomers at low ionic content display viscometric behavior characteristic of strongly associating ionic groups in solvents of low polarity. In polar solvents, such as dimethylformamide, the behavior resembles viscometrics of polyelectrolytes in aqueous solution, with a pronounced upswing in reduced viscosity at low polymer concentrations. In low polarity solvents, modest levels of alcohols and amines can result in specific solvation effects. Amines interact with zinc and transition metal ionomers much more strongly than alcohols, suggesting a coordination complex. Recent applications suggest that ionomers are very effective viscosification agents in low polarity diluents and find commercial applicability in drilling fluids.

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