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Rotational / oscillatory rheology

Rheological methods can be used to characterize the solution states of polymer solutions in terms of their flow and deformation behavior.

Rotational tests can be carried out to determine zero shear viscosities and flow curves, while oscillation measurements can be used to characterize flow and elastic properties as well as relaxation time spectra by determining storage and loss modulus values and complex viscosities.

 

Rheological analysis on a cellulose spinning solution
Rheological analysis on a cellulose spinning solution

Technical equipment

  • Rotary rheometer HAAKE MARS II with plate/plate, cone/plate as well as cylinder geometries and different tempering units for measurement between 20 and 200°C
  • Rheoscope module for simultaneous acquisition of rheological and optical data

More information

Publications

Kosan, Birgit; Römhild, Katrin; Meister, Frank: „Possibilities for Efficiency Improvement of the Lyocell Process – Effects of Molecular Mass and Molecular Mass Distribution” in: Lenzinger Berichte 93, 2017, 47-52. https://www.lenzing.com/index.php?type=88245&tx_filedownloads_file%5bfileName%5d=fileadmin/content/PDF/03_Forschung_u_Entwicklung/Lenzinger_Berichte_93_2017.pdf

Kosan, Birgit; Schwikal, Katrin; Meister, Frank: „Solution states of cellulose in selected direct dissolution agents“ Cellulose, 17, 2010, 495-506.