What is thermal stability of water soluble polyacrylamide (PAM) and partially hydrolyzed polymers?

Thermal stability of water-soluble polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (HPAM) polymers under various solution conditions have been studied utilizing Quantum Mechanics Density Functional Theory (DFT) computational modeling method.

Are cationic polyacrylamides better than anionic polyamides?

They suggested that cationic polyacrylamides (PAM) produced floc aggregates with larger size, greater shear-resistant ability and higher regrowth capacity than anionic one, arising from the contribution of charge neutralization and bridging effects , , .

Do different charged PAMS affect the properties of ballasted floc aggregates?

Influence of differently charged PAMs on the properties of ballasted floc aggregates formed by ballasted flocculation at AS coagulant dosages of (a) 1.0, (b) 2.5 and (c) 8.0 mg Al/L.

How long can a Pam polymer stay thermally stable?

A recent laboratory study conducted by Seright et al. indicated that a PAM polymer can remain thermally stable in the absence of dissolved oxygen and divalent cations, so that the HPAM solution is projected to maintain at least half of their original viscosity for over 8 years at 100 °C and about 2 years at 120 °C.

Can al-based hydrolysates attract negative regions of positively charged microflocs?

For the coagulant dosage of 8.0 mg Al/L, an excessive amount of positively charged Al-based hydrolysates existing in the flocculating system were possible to attract negative regions of positively charged microflocs , , thereby improving the settling performance of these microfloc aggregates in the phase of 180-s sedimentation.

Can different charged polymers induce a ballasted floc growth process?

Based on the experimental results, a conceptual model of ballasted floc growth process induced by differently charged polymers was proposed to vividly explore the possible floc-growth mechanism (such as charge neutralization, polymer bridging, and/or electrostatic patch) occurring for each combination of coagulant dosage and PAM type.