Molecular weight distribution of polyacrylamide(PAM) which is used for flooding is one of the most important indexes for evaluating polymer. Polymer flooding has been important influence on molecular weight distribution of polymer which is used for flooding. At present

the methods on determination of molecular weight distribution have mainly light scattering method

Gel Permeation Chromatography (GPC)

GPC coupling technique and rheology method etc. It is introduced these analysis methods and its application range in detail introduction

compared their features and scope and looked the development trend of method and technique. Light scattering method is mainly used for research. GPC method has advantages of simple and high experiment accuracy. GPC coupling technique not only can widen the range of application but also improve the sensitivity. However

the application of molecular weight distribution measurement of GPC still needs to make amount of research. Rheology method has well development because it can save the stage of dissolving polymer; meanwhile

it can resolve the problem of low sensitive which is the polymer owed high molecular weight and long-chain degree of branching.