| Viscosity is an important character of water-soluble polymer solution, meanwhile, it is basic data for chemical engineering, petroleum and fluid engineering. There are many articles about the characters of water-soluble polymer dilute solution viscosity at present, but there are much fewer reports about the research of viscosity of water-soluble polymer concentrated solution because of complication of influence factor. It is necessary to study the influence factor of viscosity of water-soluble polymer concentrated solution and a prediction model for viscosity.In this paper, polyacrylamide(PAM) , as a water-soluble polymer is studied. The relationship between conditions of dissolving and viscosity of concentrated aqueous solution of polyacrylamide has been investigated. Expain the influence of conditions of dissolving on viscosity by means of theory of dissociation and regeneration of hydrogen bond.This paper has studied the viscosity behavior of water-solution polymer with different concentration, molecular weight. On the basis of Huggins equation, modifing the equation , obtaining a modificatory Huggins equation with two variables that can depict the viscosity characters of water-soluble polymer concentrated solution. The main work of this paper as following:1. The effect of conditions of dissolving on ultimately viscosity of polyacrylamide(PAM) solution has been investigated. The study showed that ultimately viscosity of polyacrylamide solution quite different from conditions of dissolving. It was found that the viscosity of PAM solution is stable when the dissolution was finished. It was also found that the viscosity of hydrolysis polyacrylamide(HPAM) and poly sodium acrylate solution is stable in different conditions of dissolving. It was suspected that the PAM solution probably formed secondary structure which determining the viscosity of solution. The forming of the secondary structure is subjected to stirring rate, temperature and is subjected to theequilibrium state of dissociation and regeneration of hydrogen bond. The stirring rate and temperature didn't influenced the viscosity of solution when the solution are formed.2. And then, put molecular weight and concentration as a function of Huggins coefficient according to the data measured, we deal with it in regression method, obtaining a modificatory Huggins equation with two variables that can depict the viscosity characters of water-soluble polymer concentrated solution:Where η is viscosity, mPaS; Mw is molecular weight, 106g/mol; [η] intrinsicviscosity, mL/g; η0 is viscosity of pure water, mPaS; c is concentration, g/100mL;Ka, Kb, Kc, K1, K2 is constant.Contrast the equation with the data of viscosity, the results from the equation are in good agreement with the experimental data. Result indicating that the equation is suitable for higher molecular weight( more than 5 X 106), concentrated solution (more than 0.09 %).3. Viscosity model applied to the correlation and prediction of experimental liquid viscosities of poly sodium acrylate and contrast the equation with the data of viscosity, the result is satisfied.On the basis of data of viscosity polymer, if we confirm the coefficient of the model, Ka, Kb, Kc, K1, K2, then we can predict viscosity of water-soluble polymer.
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