Effect of synthesis approach on viscosity property of hydrophobic associated molecule modified polyacrylamide

Hydrophobic monomer is prepared in our lab,which is employed to prepare tripolymer together with ionic monomer and acrylamide,so as to increase the viscosity of polyacrylamide and the resistance to high temperature and high shear rate as well as high salt concentration.Rotary viscosimeter is employed to reflect the effect of the composition,shear,temperature and salt concentration on viscosity of the modified polyacrylamide was studied in different synthesis approaches.The result shows that inverse emulsion polymerization product has the better comprehensive properties.Critical associated concentration less than 0.04 g/dL,the viscosity keeps over 60% at 85 ℃.And the apparent viscosity of the copolymer with the hydrophobic monomer appears higher recovery ratio(100%) after suffering shearing.As well in the paper,certain kind of small compound is used for keep high viscosity of the modified polymer against Fe2+.