University Chemistry ›› 2021, Vol. 36 ›› Issue (8): 2010068.doi: 10.3866/PKU.DXHX202010068

• Chemistry Laboratory • Previous Articles     Next Articles

Improvement on Measuring the Intrinsic Viscosity of Cellulose by the Copper Ethylenediamine Method

Peng Liu1, Hongbin Zhang1, Sinong Wang1, Boxu Gao2, Yueer Yan1,*(), Yi Tang2,*()   

  1. 1 Institute for Preservation and Conservation of Chinese Ancient Books, Fudan University Library, Fudan University, Shanghai 200433, China
    2 Department of Chemistry, Fudan University, Shanghai 200433, China
  • Received:2020-10-28 Accepted:2020-11-23 Published:2020-12-23
  • Contact: Yueer Yan,Yi Tang;


An improved experiment for determining the intrinsic viscosity of cellulose through the copper ethylenediamine method is introduced. In this method, lignin has a great impact on determination of the intrinsic viscosity of cellulose. In order to explore this issue, a cellulose-lignin model was constructed to discuss the influence of lignin content on intrinsic viscosity of cellulose. Moreover, an improved calculation method was used for cellulose in this model to obtain a more accurate intrinsic viscosity and degree of polymerization of cellulose. In addition, the impact of different dissolution times on the intrinsic viscosity of cellulose copper ethylenediamine when in contact with air was also discussed. This experiment is a basic characterization experiment of cellulose-related materials. By learning this experiment, students can understand the basic properties and dissolution mechanism of cellulose, as well as the determination of viscosity of polymer materials and the use of viscometer. They can also learn to build a simple model to explore the influence of different components.

Key words: Cellulose, Lignin, Copper ethylenediamine, Intrinsic viscosity


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