Fig. 1. Effect of anionic polyacrylamides of three molecular weights (3.5 x 10³, 2 x 10⁵, 8 x 10⁶) at similar hydrolysis levels (85%) on the rheology behavior of Na-montmorillonite suspensions at concentration of 20 g L^-1 and pH 7, in the absence of free electrolytes. NP = absence of PAM.

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