The properties of fractionated polyacrylamide(PAAM
Mw 104-107) in dilute aqueous salt solutions were studied by light scattering and viscometric methods. The relationships among intrinsic viscosity
mean square redius of gyration )z
the second virial coefficient A2 and weight average molecular weight were observed respectively. Additional results PAAM in 0.2 mol/1 NaCl aqueous solution were also obtained from a excluded volume exponent v = 0.566 A2: The ratio of the mean square end to end distance to 2>2 equals 6.68 and the interaction parameter between macromolecules and solvents is 0.489.