Viscosity method is one of the commonly used methods to characterize the molecular weight of polymer. It has the advantages of convenient operation

simple equipment

high experimental accuracy

wide range of molecular weight application

and it has been widely used in industrial production and scientific research. The experiment project of "Measuring the molecular weight of polymer by viscosity method" is an important item in the experiments of polymer physics. The traditional viscosity teaching experiment is only to determine the molecular weight of polymer separately without considering its influencing factors. The experiment content is single and lacks of systematicness. In this paper

the traditional confirmatory experimental item is transformed into comprehensive one through the design and expansion of the original experiment content. It is helpful for students to understand the principle and application of the viscosity method more deeply

understand the formation mechanism of different polymer crystalline forms more vividly

and stimulate their enthusiasm for learning

and have a good teaching results.