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24th September 2018
64-bit RheoPower 5.0 analyses still more accurate thanks to developments. Easy to deploy databases. Read more >>

16th April 2017
Tommi Borg visits for your meetings at Chinaplas May 16-19, 2017 - Guangzhou, PR China.

24th November 2015
New published paper "Linear viscoelastic model for different flows based on control theory", Appl. Rheol. Read more >>

7th November 2014
RheoPower 4.3 is also available as true 64-bit for heavy computations. Read more >>

20th August 2014
Tommi Borg gives an oral presentation at The International Conference on Polyolefin Characterization (ICPC) September 21-24, 2014 - Valencia, Spain. >>


From MWD to the modelled viscoelastic properties

During development of new polymers you can simulate the influence of different forms of MWD's or branching degrees. Also you get accurate information for engineering and design use such as viscosity at high shear rates. You can draw or import MWD data of GPC or SEC and use earlier data as repository during polymer tailoring by simulation or for other RheoPower programs.

Respectively the main tool bar of RheoDeveloper and MWD-viscosity chart are shown in front of the figure. You can adjust the elasticity by P'and viscosity by P'' of polymer.


  • General information on MWD influences.
  • Data feeder for third party flow modeling software.
  • Design aid for new polymers and extrusion processes.
  • Design aid for extrusion dies.
  • General knowledge of relations and structure.
  • Requirements for RheoDeveloper

  • Elastic and viscous component values gained with RheoAnalyzer.
  • Structure and flow factors of polymer or material and one data point of viscosity.
  • Simulations of Relaxation Modulus

    Relaxation modulus can be simulated for the polymer with a different shear history for the respective shear rate at the beginnig. Not only the shear history but also the imposed-ramp strain affects the molecular orientation, and during practical tests the polymer always exhibits a higher effective shear rate, giving a lower effective viscosity. - Click on the figure to zoom it.

    Simulated relaxation modulus at different effective shear rates related to effective zero relaxation modulus. - Click on the figure to zoom it.

    What-if analyses

    Other properties and the influence of changes in the MWD on the behavior can be simulated using what-if analyses. This enables the background of principle, where is possible to compute to the both directions.

    What-if analyses for Lupolen 1840H LDPE reveals large changes in modelled viscosity, relaxation modulus, and spectrum. - Click on the figure to zoom it.

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