The structure and properties of poly(acrylamide acrylic acid)[P(AM-AA)]/poly (acrylamide dimethyldiallyammonium chloride)[P(AM-DMDAAC)] complex solution formed through Coulomb force were studied by means of dynamic light scattering

viscosity and transmittance measurements.The results show that conformation and hydrodynamic radius of the complex in solution are mainly affected by such factors as composition of the complex solution

polymer concentration

and NaCl content.Proper interaction between P(AM-AA)and P(AM-DMDAAC)results in a complexed homogeneous solution where

compared to the constituents

the paired polyelectrolyte molecules have more expanding conformation and larger hydrodynamic radius and

therefore

the comolex solution has higher viscosity.While too strong interaction between P(AM-AA) and P(AM-DMDAAC)or screening effect of NaCl on complexation of P(AM-AA)with P(AM-DMDAAC) result in a more compact or a more coiled complex structure

leading to a reduction in hydrodynamic radius of the complex and hence a decrease in solution viscosity.