Impact of additives on the rheological properties of associating water‐soluble multiblock polyelectrolytes

Abstract

The impact of additives on the rheological behavior of four associating water‐soluble multiblock polyelectrolytes previously synthesized via reversible addition‐fragmentation chain transfer (RAFT) polymerization was described. These polyelectrolytes contained different number of blocks ranged from 1 to 7 divided into hydrophilic and hydrophobic. The rheological analyses of polymers were performed at 25°C at a given concentration (0.1–15 wt%) in the presence of sodium chloride (NaCl) 0.1–0.5 M, sodium dodecyl sulfate (SDS) 2–10 mM or a mixture of both. Data demonstrated an increase in the viscosity of macroRAFT (ɳ = 0.002–9 Pa·s) and triblock copolymer‐TBC (ɳ = 0.003–0.04 Pa·s) versus the concentration of NaCl. Meanwhile, the viscosity of penta and heptablock copolymer exhibited a diminution whatever the (NaCl) used. Results from the rheological analyses of the associative polyelectrolytes at different (SDS) revealed that the viscosity of macroRAFT and triblock copolymer was kept constant in spite of the increment of the (SDS) while the viscosity of PBC and HBC displayed a pronounced diminution at the lower (SDS). Finally, the results from the rheological analyses of these polyelectrolytes versus a mixture of NaCl‐SDS showed a diminution in the viscosity of these solutions at any concentration of additives.

Synthesis and rheological properties of water soluble ionic copolymers as modifier fluids at high temperature and saline media

“…This can be assigned by the breakdown of the electrostatic repulsions of PAMPS‐Na from aqueous polymer solutions, therefore polymeric chains adopt a coil shape in aqueous solution conducting to a shrinkage of the hydrodynamic volume. This behavior was previously observed and reported for polyelectrolytes from acrylic acid 66,67 . On the contrary, the polymeric chains of A 25 N 25 P 50 , A 45 N 45 P 10 , and A 35 N 35 P 30 dissolved in aqueous media without addition of salt could allow electrostatic repulsion (i.e., extended shape) which led to an increase in three studied parameters.…”

“…This behavior was previously observed and reported for polyelectrolytes from acrylic acid. 66,67 On the contrary, the polymeric chains of A 25 N 25 P 50 , A 45 N 45 P 10 , and A 35 N 35 P 30 dissolved in aqueous media without addition of salt could allow electrostatic repulsion (i.e., extended shape) which led to an increase in three studied parameters. By addition of higher amount of NaCl (10, 15, 20,…”

A novel hydrophobically associating water-soluble polymer used as constant rheology agent for cement slurry

“…Muñoz-López et al . demonstrated the influence of salt on rheological properties of polyelectrolytes [ 29 ]. To investigate the effect of salt environment on the viscosity–temperature relationship, the viscosity test of aqueous solution with 0.6% concentration of NHAWP was performed under different salt concentration conditions.…”