ahmad dadvand koohi - chemical engineering department
mohsen vafaie seftie - chemical engineering department
abdolsamad zarrin ghlam - chemical engineering department
asefe mousavi moghadam - chemical engineering department

Among the methods available to reduce water production, injecting a gelling system composed of a polymer and a crosslinker has been widely used. In this work , a hydrogel was prepared by crosslinking of the aqueous solution of AMPS 2-acrylamido -2methyl-propanesulfonic - acid sodium salt , acrylamide co - polymer PAMPS and chromium acetate III. study of the viscoelastic behavior of hydrogels using dynamic rheometry showed that the storage modulus of the hydrogels increased with increasing of the co-polymer concentration and the crosslinker/co-polymer ratio, but in low concentrations 5500,7500ppm of co-polymer , there was no more effect on the elastic modulus by increasing of the crosslinker/co-polymer ratio. therefore the effect of co-polymer and crosslinker concentrations on the apparent plastic viscosity of the gel was investigated. increasing of solvent ionic power caused a decrease in the late gel strength , in which the effect of divalent ions was more than monovalent ions.

polymer gels , strong modulus , loss modulus , rheology.