Star-shaped Hydrophobically Associating Water-soluble Polymer(P(AM/NtBA/NaAMPS))was prepared by single electron transfer living radical polymerization(SET-LRP)with acrylamide(AM)

sodium 2-acrylamido-2-methylpropane sulfonate(NaAMPS)and N-tert-butylacrylamide(NtBA)as comonomer

Cu

0

powder and Me

6

-TREN as catalytic system and CCl

4

as multifunctional initiator. Effects of the initiation temperature

hydrophobic monomer dosage

AMPS dosage

initiator dosage

catalyst dosage and monomer concentration on molecule weight were investigated by Control variable method. The optimum synthesis conditions were determined and the solution properties were investigated.The results show that as the acrylamide(AM) content is 93.6%(mol)in total monomer

2-Acrylamide-2-methylpro panesulfonic acid(AMPS)content is 5%

N-tert-butylacrylamide(NtBA)content is 1.4%. And as the monomer concentration is 35%

the reaction temperature is 25.0℃

the mass fraction of initiator is 0.4942%

the amount of catalyst is 0.0848%

the deactivation agent is 0.1192%

the maximum molecular weight of the star-shaped hydrophobically associating water-soluble polymer can reach up to 2.67×10

6

.The polymer have temperature resistance and salt tolerance

and the solution property of star-shaped hydrophobically associating water-soluble polymers was similar to the line-shaped polymer. In addition

the effect of CaCl

2

on the apparent viscosity of the hydrophobically associating polyacrylamide was more significant than NaCl.