The intrinsic viscosity([η]) of partially hydrolyzed polyacrylamide(HPAM) was measured in 1 mol/L NaCl aqueous solution.The range of hydrolysis degree(h) of HPAM was 0%~70% and polymerization degree (DP) of HPAM was 1.48×103~3.79×104.By the theories of polyelectrolyte and the Kowblansky’s studying conclusion
the function of [η] with h
DP was established as:[η]=0.1113 DP0.8329+0.9973 DP0.7531(1-0.81h1/2)h M=71DP(1+23—71h) The M in the equation is molecular weight of HPAM.The results from the equation are in good agreement with the experiments and the reference data.Its average error is±13.74%.Therefore
the molecular weight of HPAM with various degree of hydrolysis was established by these two equation.